Dell OptiPlex GX240 Systems

Users Guide

w w w. d e l l. c o m | s u p p o r t. d e l l. c o m
Notes, Notices, and Cautions
NOTE: A NOTE indicates important information that helps you make better use of your computer. NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.
Abbreviations and Acronyms
For a complete list of abbreviations and acronyms, see the Glossary.

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Information in this document is subject to change without notice. 20012002 Dell Computer Corporation. All rights reserved. Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden. Trademarks used in this text: Dell, the DELL logo, OptiPlex, and Dell OpenManage are trademarks of Dell Computer Corporation; Intel and Pentium are registered trademarks of Intel Corporation; Microsoft, Windows NT, MS-DOS, and Windows are registered trademarks of Microsoft Corporation; 3Com is a registered trademark of 3Com Corporation; IBM is a registered trademark of International Business Machines Corporation; NetWare and Novell are registered trademarks of Novell, Inc. As an ENERGY STAR partner, Dell Computer Corporation has determined that this product meets the ENERGY STAR guidelines for energy efficiency. Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own. Models: DHS, DHP and DHM , September 2002 4G172 Rev. A04

Contents

CAUTION: Safety Instructions General

When Using Your Computer

When Working Inside Your Computer Ergonomic Computing Habits Battery Disposal
Protecting Against Electrostatic Discharge

1 About Your Computer

Finding Information and Assistance Front Panel
Front Panel Door Power Button Power Light.
Speaker/Headphone Connector
Floppy Drive Access Light. Hard Drive Access Light Back Panel
Connecting Devices Parallel Connector Mouse Connector USB Connectors
Integrated Network Adapter Connector Network Cable Requirements Line-In Jack Line-Out Jack
Microphone Jack. Video Connector Serial Connectors
Keyboard Connector Inside Your Computer

System Board Components

2 Advanced Features
LegacySelect Technology Control Manageability
Dell OpenManage IT Assistant
Dell OpenManage Client Instrumentation. Security
Chassis Intrusion Detection
Padlock Ring and Security Cable Slot Password Protection. System Password Setup Password
Disabling a Forgotten Password Computer Settings
Entering System Setup. System Setup Screens
Changing the Boot Sequence During System Setup Changing the Boot Sequence in System Setup Additional System Setup Options If You Have a Problem Jumper Settings
Software Installation and Configuration

3 Installing Upgrades

Computer Cover
Opening the Computer Cover Closing the Computer Cover Expansion Cards
Installing an Expansion Card Removing an Expansion Card Removing an AGP Card
Installing an AGP Graphics Card.

About Yo ur Computer

R e s o u r c e s a n d S u p p o r t To o l s (continued) Resources Contents Service and Registration Labelslocated on the front or side of your Dell computer. Express Service Code and Service Tag Number Product Key (also called the Product ID or Certificate of Authenticity [COA]) Operating System CD Using the Resource The Express Service Code and Service Tag Number are unique identifiers for your Dell computer. You may need the Product Key (or Product ID) number to complete the operating system setup.
To reinstall your operating system, use the Operating System CD that was shipped with your computer. NOTE: The operating system CD may not include all the latest drivers for your computer. If you reinstall your operating system, use the ResourceCD to reinstall drivers for the devices shipped with your computer. For more information about reinstalling your operating system, see the operating system installation documentation that was shipped with your computer.
Operating system installation guide
See the operating system installation guide for information on reinstalling and configuring your operating system. Click the Start button and select Help or Help and Support, depending on your operating system, to obtain more information on your operating system.

A bout Yo ur Computer

R e s o u r c e s a n d S u p p o r t To o l s (continued) Resources Contents Users guides for your computer and devices Using the Resource Depending on your operating system, double-click the Users Guides icon on your desktop or click the Start button and then select Help and Support to access the electronic documentation stored on your hard drive. Obtain information on the following: Using your computer Configuring system settings Removing and installing parts Installing and configuring software Diagnosing a problem Technical specifications Device documentation (on selected operating systems) Getting technical assistance

Users Guides

Dell Support website Go to Dell Support website at support.dell.com and complete the one-time registration. Technical support and Get help with general usage, installation, and information troubleshooting questions Downloads for your Obtain answers to technical service and support computer questions Order or delivery status Hints and tips, technology Get the latest versions of the drivers for your computer papers, service information Access documentation about your computer and devices Join online discussions with other Dell customers and Dell technical professionals Explore a list of online links to Dell's primary vendors Dell Premier Support website Service call status Top technical issues by product Frequently asked questions by product number Customized service tags System configuration detail Go to premiersupport.dell.com: The Dell Premier Support website is customized for corporate, government, and education customers. This site may not be available in all regions.

You can view the current settings at any time. Dell recommends that you print the system setup screens (by pressing <Print Screen>) or record the information for future reference. Before you use system setup, you need to know the kind of floppy drive(s) and hard drive(s) installed in your computer. If you are unsure of this information, see the Manufacturing Test Report that was shipped with your computer and is located in the Dell Accessories folder.

Entering System Setup

Turn on (or restart) your computer. When Press <F2> to Enter Setup appears in the upper-right corner of the screen, press <F2> immediately. If you wait too long and the Microsoft Windows Windows logo appears, continue to wait until you see the Windows desktop. Then shut down your computer and try again.
NOTE: To ensure an orderly computer shutdown, consult the documentation that accompanied your operating system.

System Setup Screens

The system setup screens display the current configuration information for your computer. Information on the screen is organized into four areas: Title the box at the top of all screens lists the computer name.
Computer data two boxes below the title box that display your computer processor, level 2 (L2) cache, service tag, and the version number of the basic input/output system (BIOS.) Options a scrollable box listing options that define the configuration of your computer, including installed hardware, power conservation, and security features. Fields to the right of the option titles contain settings or values. Those you can change appear bright on the screen. Those you cannot change (because they are set by the computer) appear less bright. When <Enter> appears to the right of an option title, press <Enter> to access a popup menu of additional options.
Key functions a line of boxes across the bottom of all screens that lists keys and their functions within system setup. Help press <F1> for information in the currently highlighted option.
System Setup Navigation Keys

NOTE: For Windows NT, Off is the default setting.
Primary Video Controller: determines which video controller to use when the computer boots. When Auto is selected, the computer searches first for a PCI expansion card and then for an AGP expansion card. If the computer has only an AGP expansion card installed, the computer uses the AGP card; if the computer has only a PCI expansion card installed, the computer uses the PCI card; and if the computer has both AGP and PCI expansion cards installed, the computer will use both cards. When AGP (the default) is selected, the computer uses the AGP expansion card. Video DAC Snoop: lets you correct video problems that may occur when you use certain video expansion cards. The default is Off. If you are using a video expansion card and problems such as incorrect colors or blank windows occur, set Video DAC Snoop to On.
NOTE: For Windows NT, if Primary Video Controller is set to Auto and the computer has both AGP and PCI expansion cards installed, the computer will use the PCI expansion card.
Keyboard NumLock determines whether your computer boots with the Num Lock mode activated on 101- or 102-key keyboards (it does not apply to 84-key keyboards). When Num Lock mode is activated, the rightmost bank of keys on your keyboard provides the mathematical and numeric functions shown at the top of each key. When Num Lock mode is turned off, these keys provide cursor-control functions shown by the label on the bottom of each key. Memory Information indicates the amount of installed memory detected in your computer, the computer memory speed, the amount of video memory, and the size of the display cache. After you add memory, check this option to confirm that the new memory is installed correctly and is recognized by the computer. PCI IRQ Assignment specifies which IRQ lines are assigned to the Peripheral Component Interconnect (PCI) devices installed in the computer. Press <Enter> to configure these devices. Then select the device whose IRQ line you want to change, and press the plus (+) or minus () key to scroll through the available IRQ lines. Normally you do not need to change the IRQ lines assigned to PCI devices unless a particular device, device driver, or operating system requires a specific IRQ line already in use by a PCI device. Primary Drive n and Secondary Drive n Primary Drive n identifies drives attached to the primary IDE interface connector (labeled IDE1) on the system board; Secondary Drive n identifies drives connected to the secondary IDE interface

Before lowering the retention arm, make sure of the following: Tops of all expansion cards and filler brackets are flush with the alignment bar. Notch in the top of the card or filler bracket fits around the alignment guide. Press the arm into place, securing the expansion card(s) in the computer.

Retention Arm Closure

filler bracket alignment guide alignment bar retention arm
If you have a small desktop computer, replace the expansion-card cage. Connect any cables that should be attached to the card. See the documentation for the card for information about the cards cable connections.
NOTICE: Do not route expansion card cables over or behind the expansion cards. Cables routed over the expansion cards can prevent the computer cover from closing properly or cause damage to the equipment.
Close the computer cover, reconnect the computer and devices to their electrical outlets, and turn them on.
NOTE: After you open and close the cover, the chassis intrusion detector causes the following message to appear on the screen at the next computer start-up: ALERT! Cover was previously removed. 14
Reset the chassis intrusion detector by changing Chassis Intrusion to Enabled or Enabled-Silent.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting the chassis intrusion detector.
If you installed a sound card, perform the following steps:
Enter system setup, select Integrated Devices, and change the setting for Sound to Off.
Connect external audio devices to the sound cards connectors. Do not connect external audio devices to the microphone, speaker/headphone, or line-in connectors on the I/O panel (see I/O PanelSmall Form-Factor, Desktop, and Mini-Tower Computers). If you installed an add-in network adapter, perform the following steps:
Enter system setup, select Integrated Devices and change the setting for Network Interface Card to Off. Connect the network cable to the add-in network adapters connectors. Do not connect the network cable to the integrated connector on the I/O panel (see I/O PanelSmall Form-Factor, Desktop, and Mini-Tower Computers).
Removing an Expansion Card
CAUTION: Before you perform this procedure, see CAUTION: Safety Instructions. NOTICE: Before disconnecting a device from the computer, wait 10 to 20 seconds after disconnecting the computer from its electrical outlet. Before removing a component from the system board, verify that the standby power light on the system board has turned off. To locate this light, see System Board Components. 3

Press the AGP card clip lever toward PCI slot 1. Slide the AGP card into place.

AGP Card Installation

AGP card system board AGP card clip AGP card clip tab AGP card clip lever AGP card notch
Release the AGP card clip lever, ensuring that the tab on the AGP card clip lever fits into the notch on the front end of the AGP card. Secure the AGP card by lowering the hinged lever on the back panel. Close the computer cover.

Removing an AGP Card

Raise the hinged lever on the back panel. On the AGP card clip, press the lever toward PCI slot 1. Pull the AGP card up and out of the AGP card clip.
Expansion-Card Cage (Small Desktop Computer Only)
Removing the Expansion-Card Cage
CAUTION: Before you perform this procedure, see CAUTION: Safety Instructions. 1 2
Open the computer cover. Check any cables connected to expansion cards through the backpanel openings. Disconnect any cables that do not reach the expansion-card cage once it is removed from the computer. Gently pull on the handle and lift the expansion-card cage up and away from the computer.
Expansion-Card Cage Removal 1

expansion-card cage

Replacing the Expansion-Card Cage
Align the slots in the side of the expansion-card cage with the tabs on the side of the computer, and slide the expansion-card cage down into place.
Expansion-Card Cage Replacement 1
Make sure that the riser board is fully seated in the connector on the system board. Reconnect any cables that you removed in step 2 of the previous procedure.
The telephony applications programming interface (TAPI) system-board connector uses a 4-pin cable to interface your internal TAPI-compliant expansion card with the audio system in your computer. To locate the TAPI system-board connector, see System Board Components. Your computer supports TAPI-compliant cards using the standard TAPI connector (labeled TELE). For example, you can connect your modem to the TAPI connector and then use your audio speakers and microphone as a speakerphone. The microphone carries your voice into the computer and then through the TAPI system board connector to your modem card. The callers voice enters through the modem card to the TAPI system board connector and then out to the speakers. You can also use this configuration to record and play sound files over the phone.
NOTE: See the documentation that came with the TAPI-compliant expansion card for more information on using TAPI devices and to verify the card works with your computer.
CAUTION: Before you perform this procedure, see CAUTION: Safety Instructions. NOTICE: Before disconnecting a device from the computer, wait 10 to 20 seconds after disconnecting the computer from its electrical outlet. Before removing a component from the system board, verify that the standby power light on the system board has turned off. To locate this light see, System Board Components. 3

Remove the film covering the thermal grease on the bottom of the heat sink. On the small form-factor and small desktop computers, reinstall the two screws that attach the blower to the heat sink. Lower the heat sink or blower/heat-sink assembly to the microprocessor so that the heat sink fits in the retention base. For each of the replacement metal clips, fit the end of the clip that does not have the latch over its tab on the retention base. Then, fit the middle of the clip over the middle tab on the retention base, and press down on the clips latch to secure the clip to the retention base (see the illustration for your computer in Removing the Heat Sink or Heat-Sink/Blower Assembly). On the small mini-tower computer, lower the airflow shroud over the heat sink. Plug the fan cable into its connector on the system board. Plug the 12-volt power cable into its connector on the system board. Close the computer cover, reconnect your computer and devices to their electrical outlets, and turn them on.
As the computer boots, it detects the presence of the new microprocessor and automatically changes the configuration information in system setup.
Enter system setup and confirm that the Microprocessor option correctly identifies the installed microprocessor. Run the Dell Diagnostics to verify that the new microprocessor is operating correctly.

Front Panel Inserts

Removing Front Panel InsertsSmall Form-Factor and Small Desktop Computers
Open the computer cover. Facing the front of the computer, use your fingers to remove the front panel cover.
Press on the insert until it pops free of the front panel cover.
Removing Front Panel InsertsSmall Mini-Tower Computer
Open the computer cover to a 45-degree angle and disconnect the CD/DVD drive data cable. Open the cover to a 90-degree angle and release the insert tabs from inside the computer.
Replacing Front Panel Inserts
To replace a front panel insert, follow the Removing Front Panel Inserts procedures in reverse.

Internal Drives

This computer may support the following internal drives: Small form-factor: one enhanced integrated drive electronics (IDE) hard drive; one floppy or optional Zip drive; and one optional CD, CD-RW, or DVD drive. Small desktop: one enhanced IDE hard drive; one floppy or optional Zip drive; and one optional CD, CD-RW, or DVD drive. Small mini-tower: two enhanced IDE hard drives; two floppy or optional Zip drives; and two optional CD, CD-RW, or DVD drives.
CD/DVD drive floppy drive hard drive
CD/DVD drive(s) floppy drive(s) hard drive(s)

IDE Drive Addressing

All IDE devices require that you configure the cable select setting, which assigns master and slave status to devices according to their position on the interface cable. You usually configure a drive for cable select by setting a jumper or switch, depending on the drive. Refer to the drive documentation in your upgrade kit for information on configuring devices for the cable select setting. When you connect two IDE devices to a single IDE interface cable and configure them for the cable select setting, the device attached to the last connector on the interface cable is the master or boot device (drive 0), and the device attached to the middle connector on the interface cable is the slave device (drive 1).

S m a l l Fo r m - Fa c t o r C o m p u t e r 2 3

or 4 4

floppy drive cable tab interposer board system board floppy drive connector (DSKT)
To release the cable from the connector, slide the lever until it is fully extended and then lift the cable away.

floppy drive cable lever

power cable floppy drive cable floppy drive connector
S m a l l M i n i -To w e r C o m p u t e r 1 2

Removing a Floppy Drive

On the small form-factor computer, remove the floppy drive from its sled by pulling the sled tab out while pushing the drive up and then sliding the drive out of the sled.

sled tab sled

On the small desktop and small mini-tower computers, press inward on the two tabs on the sides of the drive bay to disengage the drive from the computer. Slide the drive upward and remove it from the computer.
Installing a Floppy Drive and Reattaching Cables
Small Form-Factor Computer
Snap the replacement floppy drive into the sled and ensure that it is secure in the sled. Gently slide the floppy drive into the computer until the tabs securely click into position. Connect the interposer board to the floppy drive.
Slide the drive cable into the connector. Close the lever so that the cable is secure in the connector. Line up the hole on the bottom of the interposer board with the notch on the connector, and snap the interposer board onto the drive.
Attach the power cable to the interposer board on the floppy drive. Attach the CD/DVD drive cable and the power cable to the CD/DVD drive. Connect the floppy-drive cable to the DSKT connector on the system board.
S m a l l Fo r m - Fa c t o r C o m p u t e r 1 2
connector notch interposer board alignment hole floppy-drive cable lever
Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents. Close the computer cover, reconnect your computer and devices to their electrical outlets, and turn them on. Enter system setup and update the appropriate Diskette Drive A option to reflect the size and capacity of your new floppy drive. Verify that your computer works correctly by running the Dell Diagnostics.
Small Desktop and Small Mini-Tower Computers
If the replacement drive does not have the bracket rails attached, remove the rails from the old drive by removing the two screws that secure each rail to the drive. Attach the bracket to the new drive by aligning the screw holes on the drive with the screw holes on the bracket rails and tightening all four screws (two screws on each rail).

Basic Checks: Disconnect the cable from the computer and check the cable connector for bent or broken pins. Check for damaged or frayed cables. If the cable is not damaged, make sure that it is firmly connected to the computer. Check for interference. Keyboard extension cables can cause problems. Restart the computer.
If the problem still exists after you complete the basic checks, fill out the Diagnostic Checklist as you perform the following steps:
Turn off the computer, and then disconnect the keyboard cable and check it for bent or broken pins. Do you see bent pins? Yes. If they can be straightened, straighten them and go to step 2. If they cannot be straightened or are broken, you must replace the keyboard. No. Go to step 2.
Reconnect the keyboard to the computer. Make sure the keyboard cable is firmly connected to the computer.
Turn on the computer. If you are using a keyboard that can be configured with various switch settings, make sure the switch is set to PS/2, Enhanced XT/AT, or PC/AT. The switch settings are usually on the bottom of the keyboard, sometimes behind a panel. See the documentation that came with the keyboard for more information.
Turn off the computer, wait 30 seconds, and turn it on again. During the boot routine, do the Num Lock, Caps Lock, and Scroll Lock lights on the keyboard blink momentarily? Yes. Go to step 6. No. Go to step 7.
Use the keyboard to type some characters. Do the characters appear on the screen? Yes. The problem is resolved. No. Contact Dell for technical assistance.
Run the PC-AT Compatible Keyboards tests in the Dell Diagnostics. Did any of the diagnostics tests fail? Yes. The original keyboard may be defective. Go to step 8. No. Go to step 8.
Turn off the computer, connect another keyboard to the computer, and then turn the computer on. If you do not have another keyboard, contact Dell for technical assistance. Is the keyboard functioning properly? Yes. The original keyboard is defective. The problem is resolved. No. Contact Dell for technical assistance.

Floppy Drive Problems

During the power-on self-test (POST), the computer checks the floppy drive, comparing its characteristics with the computer configuration information. The floppy-drive access light blinks as the computer performs this check.

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NVRAM power loss

NVRAM configuration Run the System Board Devices tests in the Dell Diagnostics, if possible. Video Memory Test failure Screen initialization failure Screen retrace failure Search for video ROM failure No time tick Run the VESA/VGA Interface tests in the Dell Diagnostics. Run the VESA/VGA Interface tests in the Dell Diagnostics. Run the VESA/VGA Interface tests in the Dell Diagnostics. Run the VESA/VGA Interface tests in the Dell Diagnostics. See Getting Help for instructions on obtaining technical assistance.
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Shutdown failure Gate A20 failure Unexpected interrupt in protected mode Memory failure above address 0FFFFh Timer-chip counter 2 failure Time-of-day clock stopped Serial or parallel port test failure Failure to decompress code to shadowed memory Math-coprocessor test failure Cache test failure
See Getting Help for instructions on obtaining technical assistance. See Getting Help for instructions on obtaining technical assistance. See Getting Help for instructions on obtaining technical assistance. Run the System Memory tests in the Dell Diagnostics. See Getting Help for instructions on obtaining technical assistance. See Getting Help for instructions on obtaining technical assistance. Run the Serial Ports and the Parallel Ports tests in the Dell Diagnostics. Run the System Board Devices tests in the Dell Diagnostics, if possible. Run the System Board Devices tests in the Dell Diagnostics, if possible. Run the System Board Devices tests in the Dell Diagnostics if possible.

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Warning Messages
A warning message alerts you to a possible problem and asks you to do something before execution continues. For example, before you format a floppy, a message may warn you that you may lose all data on the floppy as a way to protect against inadvertently erasing or writing over the data. These warning messages usually interrupt the procedure and require you to respond by typing y (yes) or n (no).

Diagnostics Messages

When you run a test group or subtest in the Dell Diagnostics, an error message may result. These particular error messages are not covered in this section. Record the message on a copy of the Diagnostics Checklist found in Getting Help. Also see Getting Help for instructions on obtaining technical assistance.

Diagnostic Lights

Memory Address Conflicts

Memory address conflicts occur when two or more devices try to access the same address in the upper memory blocks (UMB). For example, if a network expansion card and an expanded-memory page frame are assigned an overlapping block of addresses, a memory address conflict arises. As a result, when you try to log in to the network, the operation fails. To resolve this type of conflict, you can change the address of one of the devices. For example, in the case of the network expansion card and expanded-memory page frame address conflict, you can move the network card to an address block in the range of CC000h through D0000h. To reassign the expansion card's address block, see the documentation for the card.
Interrupt Assignment Conflicts
Problems can arise if two devices attempt to use the same interrupt request (IRQ) line. To avoid this type of conflict, check the documentation for the default IRQ-line setting for each installed expansion card, then consult the following table to configure the card for one of the available IRQ lines.
NOTE: The following table lists default IRQ settings. In computers with Plug and Play capabilities, you can modify the default settings. If you install a Plug and Play card in a Plug and Play computer, the computer automatically selects an open IRQ line if any are available.
Default IRQ Line Assignments IRQ Line IRQ0 IRQ1 IRQ2 IRQ3 IRQ4 IRQ5 IRQ6 IRQ7 IRQ8 IRQ9 IRQ10 IRQ11 IRQ12 IRQ13 IRQ14 IRQ15 Used/Available Used by the computer timer Used by the keyboard to signal that the output buffer is full Used by interrupt controller 1 to enable IRQ8 through IRQ15 Used by serial connector 2 Used by serial connector 1 Available Used by the floppy/tape drive controller Used by the parallel port Used by the real-time clock (RTC) Used by the video graphics array (VGA) interface (optional) Available Available Used by the mouse port Used by the math coprocessor (if applicable) Used by the primary integrated drive electronics (IDE) controller Used by the secondary IDE controller

SECTION 7

Getting Help
Technical Assistance Contacting Dell

Technical Assistance

If you need help with a technical problem, Dell is ready to assist you.
CAUTION: If you need to remove the computer covers, first disconnect the computer power and modem cables from all electrical outlets. 3 4
Complete the procedures in "Solving Problems." Run the Dell Diagnostics. Make a copy of the Diagnostics Checklist and fill it out. Use Dell's extensive suite of online services available at Dell Support (support.dell.com) for help with installation and troubleshooting procedures. If the preceding steps have not resolved the problem, contact Dell.
NOTE: Call technical support from a telephone near or at the computer so that technical support can assist you with any necessary procedures. NOTE: Dell's Express Service Code system may not be available in all countries.
When prompted by Dell's automated telephone system, enter your Express Service Code to route the call directly to the proper support personnel. If you do not have an Express Service Code, open the Dell Accessories folder, double-click the Express Service Code icon, and follow the directions. For instructions on using the technical support service, see "Technical Support Service."
NOTE: Some of the following services are not always available in all locations outside the continental U.S. Call your local Dell representative for information on availability.

Online Services

You can access Dell Support at support.dell.com. Select your region on the WELCOME TO DELL SUPPORT page, and fill in the requested details to access help tools and information.
You can contact Dell electronically using the following addresses: World Wide Web www.dell.com/ www.dell.com/ap/ (for Asian/Pacific countries only) www.euro.dell.com (for Europe only) www.dell.com/la/ (for Latin American countries) Anonymous file transfer protocol (FTP) ftp.dell.com/ Log in as user: anonymous, and use your e-mail address as your password. Electronic Support Service mobile_support@us.dell.com support@us.dell.com apsupport@dell.com (for Asian/Pacific countries only) support.euro.dell.com (for Europe only) Electronic Quote Service sales@dell.com apmarketing@dell.com (for Asian/Pacific countries only) Electronic Information Service info@dell.com

AutoTech Service

How to Use Fast User Switching
To access Fast User Switching, perform the following steps:
Click the Start button and click Log Off. When the Log Off Windows screen appears, click either Switch User or Log Off.
When you select Switch User, the main user Welcome screen appears. You can then select your account name and log in. Your personal desktop appears.
What Happens When a Fast User Switch Occurs?
When a fast user switch occurs, the original user is not logged off the computer as previously happened on other Microsoft operating systems. On Windows XP the user's logon remains active, but is replaced by the new , user. Users can switch between login IDs as often as they want. However, user applications active during a user switch remain active and running in the background while the new user is working; this can result in a slower computer until the process finishes. For example, if one user is downloading a large file from the Internet and another user logs on to the computer, the file download continues in the background until it is complete. While most applications continue to run in the background during a fast user switch, multimedia applications do not. Because multimedia applications use resources that cannot easily be shared between different users on a single computer, those applications terminate during the user switch, allowing the new user to take full advantage of the multimedia capabilities.
Special Considerations With Fast User Switching
Considerations when using Fast User Switching include: Some older Windows games may not operate with a fast user switch. Multimedia games may shut down on a fast user switch. DVD software shuts down and requires a restart when the user comes back. Computers with low memory configurations can experience problems. The computer uses memory to keep the first user's programs running in the background while the second user is logged on. On computers with limited memory, this can cause the entire computer to run slowly. Fast User Switching is off by default on computers with less than 128 megabytes (MB) of random-access memory (RAM).
Fast User Switching is unavailable if the computer has Windows XP Professional installed and is a member of a computer domain.
How to Turn Off Fast User Switching
You must have a computer administrator account on the computer to turn off Fast User Switching. (For information on types of accounts, see How to Add Users.) To disable Fast User Switching, perform the following steps:
Click the Start button, and click Control Panel. In the Control Panel window, click User Accounts. Under Pick a task, click Change the way users log on or off and do one of the following: Select the Use Fast User Switching to log off check box to enable Fast User Switching. Deselect the Use Fast User Switching to log off check box to disable Fast User Switching.

106 110

11 I/O Panel
Removing the Front I/O Panel Small Desktop Computer.
Small Form-Factor Computer Small Mini-Tower Computer Replacing the Front I/O Panel

12 Memory

Removing a Memory Module Replacing a Memory Module

118 118

13 Microprocessor
Removing the Cooling Fan/Heat-Sink Assembly and Microprocessor 122 Replacing the Cooling Fan/Heat-Sink Assembly and Microprocessor. 126

14 Power Supply

Removing the Power Supply Replacing the Power Supply

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15 System Board

System Board Components

Removing the System Board Replacing the System Board

SECTION 1

B e f o r e Yo u B e g i n
Getting Started Precautionary Measures
w w w. d e l l. c o m | s u p p o r t. d e l l. c o m
This section provides procedures for removing and replacing the components, assemblies, and subassemblies in the Dell OptiPlex GX240 small form-factor, small desktop, and small mini-tower computers. Unless otherwise noted, each procedure assumes that the following conditions exist: You have performed the steps in "Precautionary Measures." You have opened the computer cover.
The GX240 computer is primarily a tool-less one, but certain procedures (such as removing the heat sink blower or the control panel) require the use of one or more of the following tools: Small flat-blade screwdriver #1 and #2 Phillips-head screwdrivers An 8-inch, #2 Phillips-head screwdriver
Also, Dell recommends that you use a wrist grounding strap as explained in "Precautionary Measures."
Before you perform any procedure in this section, read the following caution for your personal safety and to prevent damage to the computer from electrostatic discharge (ESD).
CAUTION: FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT
Before you start to work on the computer, perform the following steps in the sequence listed:
Perform an orderly computer shutdown using the operating system menu. Turn off the computer and all attached devices.

B e f o r e You B e g i n
Disconnect the computer and devices from their AC power sources. Also, disconnect any telephone or telecommunication lines from the computer. Doing so reduces the potential for personal injury or shock. If you are disconnecting a device from the computer or are removing a component from the system board, wait 15 to 30 seconds after disconnecting the computer from AC power before disconnecting the device or removing the component to avoid possible damage to the system board. Verify that the auxiliary power light on the system board is not on. If it is on, you may need to wait 15 to 30 seconds for it to go out (see "System Board Components" for the location of this light).
Wear a wrist grounding strap, and clip it to an unpainted metal surface, such as the padlock ring on the back of the computer. If a wrist grounding strap is not available, touch an unpainted metal surface on the computer, such as the power supply, to discharge static charge from your body before touching anything inside the computer. While you work, periodically touch an unpainted metal surface on the computer to dissipate static electricity that might harm internal components.
In addition, take note of the following safety guideline when appropriate: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by it edges or by its metal mounting bracket. Hold a component such as a microprocessor by its edges, not by its pins.

SECTION 2

Computer Cover
Opening the Computer Cover
NOTE: If your computer is on a stand, remove the stand before you open the computer cover. S m a l l Fo r m - Fa c t o r C o m p u t e r
Security cable slot Padlock ring Release buttons (one on each side)

Small Desktop Computer

Padlock ring Release buttons (one on each side)
S m a l l M i n i -To w e r C o m p u t e r
Remove the padlock from the padlock ring, if present.
NOTICE: Do not open the cover if the computer is on the edge of a desk or table. Doing so may cause the computer to tip over and fall. Make sure that the computer is situated so that there is at least 12 inches of desk- or table-top for the cover to rest on. NOTICE: Open the computer cover slowly to prevent damage to the system cables.
Press in on the two securing buttons until the cover is free to swing up.
NOTICE: On the small mini-tower computer, to prevent damage to the system board, open the cover until it catches at a 45-degree angle. Then remove the drive data cables from the system board and open the cover to a 90-degree angle.
Closing the Computer Cover
Check all cable connections, especially those that might have come loose during your work. Fold cables out of the way so that they do not catch on the computer cover. Make sure cables are not routed over the drive cagethey will prevent the cover from closing properly. Check to see that no tools or extra parts (including screws) are left inside the computer. On the small mini-tower computer, close the cover to a 45-degree angle and connect the drive data cables to the system board. Close the computer cover by pivoting the cover down toward the back of the computer and into position. Make sure that the securing buttons click into place. Replace the padlock, if required.

NOTE: After you open and close the cover, the chassis intrusion detector causes the following message to be displayed at the next computer startup: ALERT! Cover was previously removed.
See "Resetting the Chassis Intrusion Detector" for instructions.

SECTION 3

Inside the Computer

Key Components

NOTE: User service access points are colorcoded green. S m a l l Fo r m - Fa c t o r C o m p u t e r 4 3
Hard drive 3.5-inch floppy drive CD/DVD drive Cover release buttons (2) Internal speaker Chassis intrusion switch
System board Power supply AC power connector I/O ports and connectors Padlock ring Heat sink and blower assembly
Cover release buttons (2) Hard drive Internal speaker Chassis intrusion switch Expansion-card cage Power supply Expansion-card slots
AC power connector Padlock ring I/O ports and connectors Heat sink and blower assembly System board 3.5-inch floppy drive CD/DVD drive
Cover release buttons (2) Hard drive Internal speaker Chassis intrusion switch System board Expansion-card slots I/O ports and connectors
AC power connector Padlock ring Microprocessor and airflow shroud Power supply 3.5-inch floppy drive CD/DVD drive

Computer Cables

S m a l l Fo r m - Fa c t o r C o m p u t e r 5 6
CD/DVD drive data cable Floppy drive data cable Control panel cable CD/DVD drive power cable
IDE data cable (hard drive) Input/output cable Input/output audio cable Microprocessor power cable CD/DVD audio cable
IDE drive power cable (hard drive) 10

Small Desktop Computer 7

CD/DVD drive audio cable CD/DVD drive data cable Floppy drive data cable Control panel cable
Input/output cable Input/output audio cable IDE data cable (hard drive)
S m a l l M i n i -To w e r C o m p u t e r 8
CD/DVD drive power cable CD/DVD drive audio cable CD/DVD drive data cable Floppy drive power cable Floppy drive data cable
IDE drive power cable (hard drive) IDE drive data cable (hard drive) Input/output cable Input/output audio cable

Cable Colors

Device Hard drive Floppy drive CD/DVD drive USB ATA, IDE, or EIDE drive Control panel CD/DVD audio Computer audio Blue Black Orange Gray Green Yellow Blue Black

SECTION 4

Battery

Removing the Battery

CAUTION: There is a danger of the new battery exploding if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturers instructions. 1 2
If possible, enter system setup and print the system setup screens. Remove the system battery by carefully prying it out of its socket with your fingers or with a blunt, nonconducting object such as a plastic screwdriver.

1 Accent door 2 Front mask
Replace the control panel and secure it to the computer by replacing the screw you removed in step 2 of the removal procedure. Replace the front I/O panel.
Follow the Removing the Control Panel procedure in reverse, ensuring that the tabs on the top panel, bottom panel, and front panel are secure.

Drives

Removing the Floppy Drive Replacing the Floppy Drive Removing the CD/DVD Drive Replacing the CD/DVD Drive Removing the Hard Drive Replacing the Hard Drive Adding a Second Hard Drive Small Mini-Tower Computer
Disconnect the floppy-drive cable from the system board. Remove the power cable from the interposer board. Disconnect the CD/DVD drive cable and the power cable from the CD/DVD drive. Remove or raise the drive by pressing the green tabs on either side of the drive and lifting the drive up. Remove the floppy-drive cable from the floppy drive.
Remove the interposer board from the floppy drive by pressing the tab and rotating the interposer board.
R e m o v i n g t h e I n t e r p o s e r B o a r d S m a l l Fo r m - Fa c t o r Computer 2 3
Floppy-drive cable Tab Interposer board System board floppy-drive connector (DSKT)
To release the floppy-drive cable from the connector, slide the lever until it is fully extended, and then lift the cable away.
52 Removing the Floppy-Drive Cable or 2 1

Floppy-drive cable Lever

Remove the floppy drive from its sled by pulling the sled tab out while pushing the drive up, and then sliding the drive out of the sled.
Disconnect the power cable and the floppy-drive data cable from the drive. Disconnect the data cable from the floppy-drive connector on the system board.

Cable Removal 1 2

Power cable Floppy-drive data cable Floppy-drive connector
Press inward on the two tabs on the sides of the drive bay to disengage the drive from the computer. Slide the drive upward and remove it from the computer.

Floppy-Drive Removal

Interposer Board Removal

Interposer board
Press inward on the two tabs on the sides of the drive to disengage the drive from the computer. Slide the drive upward and remove it from the computer.

CD/DVD Drive Removal

Remove the data, power, and audio cables from the drive.

Cable Removal 2 1

Power cable Audio cable Data cable Drive connector
Press inward on the two tabs on the sides of the drive bay to disengage the drive from the computer. Slide the drive upward and remove it from the computer. If the replacement drive does not have the bracket rails attached, remove the rails from the old drive by removing the two screws that secure each rail to the drive.

Cable Removal 3

Replacing the CD/DVD Drive
Gently slide the drive into place until the tabs securely click into position. Connect the interposer board to the CD/DVD drive.
Ensure that the interposer board tab fits securely under the notch on the inside of the cover. Attach the power and audio cables to the interposer board.
68 Interposer Board Replacement or 3 3
1 Interposer board 2 Notch on inside of cover 3 Interposer board tab
If your computer came with a CD drive, use the spare connector on the existing interface cable. Otherwise, use the IDE interface cable provided in the drive kit.
Connect the data, power, and audio cables to the drive. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents. If the drive bay was previously empty, remove the front-panel insert from the front panel.
Remove the front-panel cover with your fingers. Remove the insert by pressing it until it pops free. Replace the front-panel piece by snapping it into place.
Gently slide the drive into place until the tabs securely click into position. Connect the data, power, and audio cables to the drive.

Cable Replacement 2 1

If your computer came with an IDE CD drive, use the spare connector on the existing interface cable. Otherwise, use the IDE interface cable provided in the drive kit.
If you are installing a drive that has its own controller card, install the controller card in an expansion slot. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents.

If the drive bay was previously empty, remove the front-panel insert from the front panel.
Release the insert tabs from inside the chassis. Remove the insert by pressing it until it pops free. Replace the front-panel piece by snapping it into place.

Cable Replacement

If you are installing a drive that has its own controller card, install the controller card in an expansion slot. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents. If the drive bay was previously empty, remove the front-panel insert from the front panel.

Removing the Hard Drive

Disconnect the power cable and hard-drive cable from the drive.

Cable Removal

Power cable Hard-drive cable
Press in on the tabs on each side of the drive, and slide the drive toward the I/O panel until the notch in the drive rail allows the drive to be removed from the computer.

Hard Drive Removal

Notch in drive rail Tabs (2)
The hard drive may or may not have a plastic shroud cover. (Operating the computer without a hard-drive shroud does not affect its performance.) If your computer's hard drive does not have a shroud, proceed to the next step. If your computer's hard drive does have a shroud, remove it by pressing in on the indented tab at the top of the shroud and lifting the shroud away.
Hard-Drive Shroud Removal
NOTE: Your computers hard drive may or may not have a plastic shroud cover. Operating the computer without a harddrive shroud does not affect its performance.
Disconnect the power and hard-drive data cables from the drive.

Cable Removal 1

Hard-drive cable Power cable
Press in on the tabs on each side of the drive and slide it up and out.

Tabs (2)

Replacing the Hard Drive
NOTICE: To avoid possibly damaging the drive by ESD, ground yourself by touching an unpainted metal surface on the back of the computer. NOTICE: When you unpack the drive, do not set it on a hard surface, which may damage the drive. Instead, set the drive on a surface, such as a foam pad, that will sufficiently cushion it. 1 2

Gently slide the drive into place until you hear it securely click. Connect the power cable to the drive, and connect the IDE data cable to the drive and the IDE1 connector on the system board.

Hard Drive Replacement

Power cable IDE data cable IDE1 connector
On the small desktop computer, if your computer has a hard-drive shroud, replace the shroud by inserting the two tabs on the bottom into the holes in the computer and snapping the top into place. (Operating the computer without a hard-drive shroud does not affect its performance.). Check all connectors to be certain that they are properly cabled and firmly seated.
NOTICE: To avoid possible damage to the computer, you must match the colored stripe on the hard-drive data cable with pin 1 on the hard-drive (IDE1) connector and with the system board interface connector (IDE1).
To locate the system board interface connector (IDE1), see "System Board Components."
If the drive you just installed is the primary drive, insert a bootable floppy disk into the floppy drive. Turn on the computer. Enter system setup and update the appropriate Primary Drive option, 0 or 1. See the User's Guide for complete information on system setup.
Reset the chassis intrusion detector. Restart the computer. Partition and logically format the computer's hard drive before proceeding to the next step. For partition and format instructions, see the documentation that came with the operating system.
Test the hard drive by running the Dell Diagnostics. See "Solving Problems" in the User's Guide for complete information.
If the drive you just installed is the primary drive, install the operating system on the hard drive. For instructions, see the documentation that came with the operating system.
NOTICE: Ground yourself by touching an unpainted metal surface on the back of the chassis. NOTICE: When you unpack the drive, do not set it on a hard surface, which may damage the drive. Instead, set the drive on a surface such as a foam pad that will sufficiently cushion it. 3

Unpack the drive, and prepare it for installation. Check the documentation for the drive to verify that it is configured for your computer. Open the computer cover.
Remove the two green plastic drive rails inside the lower hard-drive bay. These rails are not attached with screws to the inside of the hard-drive bay. To remove the rails, gently pull the rails up and out of the bay.
Attach the rails to the hard drive using the two screws attached to the rails. Ensure that the rail tabs are positioned at the back of the hard drive.
NOTICE: Do not install a drive into the lower hard-drive bay until you remove the green drive rails from inside the lower hard-drive bay.
Remove the first hard drive from the upper bay and install it in the lower bay.
Disconnect the power cable and the data cable from the back of the first hard drive. Press in the two green rail tabs and pull the first hard drive out of the upper bay. Gently slide the first hard drive into the lower bay until you hear a click. Reconnect the power cable and the data cable to the back of the hard drive.
Gently slide the new hard drive into the upper bay until you hear a click.
Second Hard Drive Installed
1 Rail tabs (2) 2 Second hard drive in upper bay 3 First hard drive in lower bay 4 Hard drive cage NOTICE: Match the colored strip on the cable with pin 1 on the drive.
Locate the extra connector on the drive cable that is attached to the first hard drive and attach the connector to the second hard drive.

SECTION 8

Expansion Card
Expansion Card Types Removing an Expansion Card Replacing an Expansion Card Removing an AGP Graphics Card Replacing an AGP Graphics Card
Your computer provides expansion slots for the following cards: In the small form-factor computer, one low-profile, 32-bit, 33-MHz PCI card. In the small desktop computer, up to two 32-bit, 33-MHz PCI cards. In the small mini-tower computer, up to four 32-bit, 33-MHz PCI cards.
All of the form factors provide an expansion slot for one 32-bit, AGP 4x card (low-profile in the small form-factor and small desktop computers) operating at 1.5 V.

Expans ion Card

Expansion Cards
NOTE: Before disconnecting a device from the computer or removing a component from the system board, verify that the auxiliary power light on the system board is off. For the location of this light, see "System Board Components."
AGP 4x card Low-profile 32-bit PCI card 32-bit PCI card
Removing an Expansion Card
CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures."
If necessary, disconnect any cables connected to the card.
Press the hinged lever on the expansion card retention arm and raise the retention arm. Grasp the card by its outside corners and ease it out of its connector on the riser board. If you are removing the card permanently, install a metal filler bracket over the empty card-slot opening.

Expansion Card Removal

Card-edge connector Expansion card Hinged lever Retention arm Expansion-card connector
Remove the expansion-card cage. If necessary, disconnect any cables connected to the card.
Press the lever on the expansion card retention arm and raise the retention arm.

Expansion Card Removal 3

Retention arm Lever Expansion card Card-edge connector
Expansion-card connector Riser board Expansion-card cage
Grasp the card by its outside corners and ease it out of its connector on the riser board. If you are removing the card permanently, install a metal filler bracket over the empty card-slot opening.
If necessary, disconnect any cables connected to the card. Press the lever on the expansion card retention arm and raise the retention arm.
S m a l l M i n i -To w e r C o m p u t e r 3
Expansion card Card-edge connector Expansion-card connector Retention arm Lever
Replacing an Expansion Card
Small Form-Factor, Desktop, and Mini-Tower Computers
CAUTION: Some network cards automatically start the computer when they are connected. To guard against electrical shock, be sure to unplug the computer from its electrical outlet before installing any expansion cards. 1
Prepare the expansion card for installation. See the documentation that came with the expansion card for information on configuring the card, making internal connections, or otherwise customizing it for your computer.
Follow the procedures, in reverse order, for your particular computer in "Removing an Expansion Card." Place the expansion card on the connector and press down firmly. Make sure that the card is fully seated in the slot. If the expansion card is full-length, insert the end of the card into the expansion-card guide bracket as you lower the card toward its connector on the system board. Insert the card firmly into the expansion-card connector on the system board.
Expansion Card Connection 4 3
Bracket within slot Bracket caught outside of slot Fully seated card Not fully seated card
Before lowering the retention arm, make sure of the following: Tops of all expansion cards and filler brackets are flush with the alignment bar. Notch in the top of the card or filler bracket fits around the alignment guide. Press the arm into place, securing the expansion card(s) in the computer.

Retention Arm Closure

Filler bracket Alignment guide Alignment bar Retention arm
Reconnect the computer and devices to their electrical outlets and turn them on.
NOTE: After you open and close the cover, the chassis intrusion detector causes the following message to be displayed at the next computer start-up: ALERT! Cover was previously removed.

Removing an AGP Graphics Card
Remove the filler bracket by raising the hinged lever and then sliding the bracket up.
AGP Slot Filler Bracket Removal

1 Hinged lever 2 3

On the AGP card clip, press the lever toward the PCI slot 1. Pull the AGP card up and out of the AGP card clip.
On the hinged lever, press the indentation with your thumb at an angle toward the system board until you release the tab. Continue holding the lever and pull the lever up. Slide the filler bracket up.
AGP Slot Filler Bracket Removal 2 1
Hinged lever Indented tab
AGP Slot Filler Bracket Removal 1

Hinged lever

On the AGP card clip, press the lever toward PCI slot 1. Pull the AGP card up and out of the AGP card clip.
Replacing an AGP Graphics Card
S m a l l Fo r m - Fa c t o r, S m a l l D e s k t o p , a n d S m a l l M i n i -To w e r Computers
AGP card System board AGP card clip
AGP card clip tab AGP card clip lever AGP card notch
Press the AGP card clip lever, ensuring that the tab on the AGP card clip lever fits into the notch on the front end of the AGP card. Secure the AGP card by lowering the hinged lever on the back panel.

SECTION 9

Expansion-Card Cage (Small Desktop Computer Only)
Removing the Expansion-Card Cage
CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures." 1
Examine any cables connected to expansion cards through the backpanel openings, and disconnect any cables that will not reach the expansion-card cage once it is removed from the computer. Remove any cables connected to the expansion card. Gently pull on the handle and lift the expansion-card cage up and away from the computer.
Expansion-Card Cage Removal
Replacing the Expansion-Card Cage
Align the slots in the side of the expansion-card cage with the tabs on the side of the computer, and slide the expansion-card cage down into place. Make sure that the riser board is fully seated in the RISER connector on the system board.
Expansion-Card Cage (Sma ll Desktop Computer Only)

Microprocessor
Removing the Cooling Fan/Heat-Sink Assembly and Microprocessor Replacing the Cooling Fan/Heat-Sink Assembly and Microprocessor
Removing the Cooling Fan/Heat-Sink Assembly and Microprocessor
CAUTION: Use a wrist grounding strap as explained in "Precautionary Measures." CAUTION: The microprocessor and heat sink assembly can get extremely hot. To avoid burns, be sure both have had sufficient time to cool before you touch them. 3
Disconnect the fan cable from the system board. Disconnect the 12-volt power cable from the system board. On the small mini-tower computer, rotate the airflow shroud.
A i r f l o w S h r o u d R o t a t i o n S m a l l M i n i -To w e r C o m p u t e r

Airflow shroud

On the small mini-tower computer, press down on the metal securing latches to release the securing clips from the retention base. Then lift the clips out of the tabs on the retention base and away from the heat sink.
H e a t S i n k R e m o v a l S m a l l M i n i -To w e r C o m p u t e r 2
Securing latches (2) Securing clips (2) Heat sink
Retention base ZIF socket Tabs (3)
On the small form-factor and small desktop computers, remove the securing clips to remove the heat sink/blower assembly. The heat sink is attached to the blower.
H e a t S i n k / B l o w e r A s s e m b l y R e m o v a l S m a l l Fo r m - Fa c t o r and Small Desktop Computers 2
Latches (2) Securing clips (2) Blower
Screws (2) Heat sink Retention base
NOTICE: Before you remove the heat sink, gently rock the heat sink, and then slightly twist it as you lift it from the system board. 6 7
Lift the heat sink or heat sink/blower assembly away from the microprocessor. On the small form-factor and small desktop computers, remove the two screws on the blower to remove it from the heat sink.
NOTICE: Do not discard the original heat sink and securing clips unless you are installing a microprocessor upgrade kit from Dell. If you are not installing a microprocessor upgrade kit from Dell, reuse the original heat sink, blower, and securing clips when installing your new microprocessor. NOTICE: Lay the heat sink down with the thermal grease facing upward. Do not lay the heat sink down with the thermal grease touching the work surface. 8
Discard the original heat sink and securing clips.

Microprocessor Removal

Release lever Microprocessor ZIF socket
NOTICE: Be careful not to bend any of the pins when you remove the microprocessor from the ZIF socket. Bending the pins can permanently damage the microprocessor.
The ZIF socket has a lever-type handle that secures and releases the microprocessor from the ZIF socket.
Pull the socket release lever straight up until the microprocessor releases.

NOTE: After you open and close the cover, the chassis intrusion detector causes the following message to be displayed at the next system start-up: ALERT! Cover was previously removed.
Enter system setup and confirm that the system data area correctly identifies the type of installed microprocessor. For instructions on using system setup, see the User's Guide.
While in system setup, reset the Chassis Intrusion option by pressing the left- or right-arrow key to select Reset and then choosing Enabled, Enabled-Silent, or Disabled. See the User's Guide for information on the chassis intrusion detector.
Run the Dell Diagnostics to verify that the new processor is operating correctly. See the Users Guide for information on Dell Diagnostics.

SECTION 14

Power Supply
Removing the Power Supply
Release button AC power connector

Po w e r S u p p l y

Disconnect the AC power cable from the back of the power supply. Disconnect the DC power cables from the system board and the drives. Note the routing of the DC power cables underneath the clips in the computer as you remove them from the system board and drives. It is important to route these cables properly when you replace them to prevent them from being pinched or crimped.
On the small desktop computer, remove the expansion-card cage and remove the power cables from the side of the hard drive. To remove the power cables, use the cables as leverage and pull away from the clips while simultaneously pulling on the metal clips with your fingers. On the small mini-tower computer, remove the two screws that attach the power supply to the rear wall. Press the release button. On the small desktop computer, press down on the handle, which in turn presses on the release button. Slide the power supply toward the front of the computer approximately 1 inch.
Lift the power supply up and out of the computer.
Replacing the Power Supply
Slide the power supply into place. Reconnect the DC power cables. Connect the AC power cable to the connector. On the small desktop computer, reattach the power cables to the side of the hard drive and replace the expansion-card cage. Run the cables underneath the clips. Press the clips to close them over the cables.

SECTION 16

System Board
System Board Components Removing the System Board Replacing the System Board

System B o ard

Floppy drive Internal speaker EIDE2 connector Front panel connector EIDE1 connector Suspend-to-RAM light PCI riser (small mini-tower computer only) Auxiliary power light AGP connector PCI connectors CD audio connector Telephony connector (TAPI) Front audio connector Microphone connector Audio line-in connector

Remove the heat sink assembly and microprocessor from the existing system board and transfer them to the replacement system board. Configure the settings of the replacement system board.
Set the jumpers on the replacement system board so it is identical to the one on the existing board. Orient the replacement board by aligning the notches on the bottom to the tabs on the computer floor. Slide the board toward the back of the computer until it clicks into place. Replace any components and cables that you removed from the system board. Reconnect all cables to their connectors at the back of the computer, close the computer cover, and reconnect the computer and devices to their power sources and turn them on.
NOTE: After you close the cover, the chassis intrusion detector causes the following message to be displayed at the next computer start-up: ALERT! Cover was previously removed. NOTE: Some components and connectors on the replacement system board may be in different locations than the corresponding connectors on the existing system board.
Reset the chassis intrusion detector.