Dell E521 specifications Installing the Computer Cover, Installing the System Board

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1

system board

2

heat sink assembly bracket

3

screws (8)

Place the system board assembly that you just removed next to the replacement system board to ensure it is identical.

Installing the System Board

1.Gently align the board into the chassis and slide it toward the back of the computer.

2.Using the six screws, secure the system board to the chassis.

3.Install the heat sink assembly bracket and secure using the two green screws.

NOTE: The heat sink bracket assembly must be properly oriented to allow proper installation of the heat sink assembly.

4.Replace the cables that you removed from the system board.

5.Replace the memory modules into the memory sockets at the same locations from which you removed them (see Installing Memory).

6.Replace the processor (see Installing the Processor).

7.Install the heat sink assembly:

a.Place the heat sink assembly back onto the heat-sink assembly bracket.

b.Rotate the heat sink assembly down towards the computer base and ensure that the two captive screws are properly aligned with the holes in the system board.

c.Tighten the two captive screws.

NOTICE: Ensure that the heat sink assembly is correctly seated and secure.

8.Replace any add-in cards on the system board.

9.Replace the computer cover (see Installing the Computer Cover).

10.Connect your computer and devices to an electrical outlet, and turn them on.

11.Verify that the computer works correctly by running the Dell Diagnostics (see Dell Diagnostics).

Installing the Computer Cover

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.

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Contents Model Dcsm Front View of the Computer About Your ComputerBack View of the Computer Back Panel ConnectorsBack to Contents Light Pattern Problem Description Suggested Resolution Advanced TroubleshootingPower Lights Diagnostic LightsCode Cause Beep CodesSystem Messages Diskette read failure Click the Change or Remove Program iconStarting the Dell Diagnostics Dell DiagnosticsIdentifying Drivers Dell Diagnostics Main MenuWhat Is a Driver? DriversWindows XP Reinstalling DriversUsing Windows XP Device Driver Rollback Manually Reinstalling DriversClick Start, then click Help and Support Resolving Software and Hardware IncompatibilitiesTurning Off Your Computer Before You BeginGetting Started Recommended ToolsBack to Contents Removing the Computer Cover Removing and Installing PartsMemory Memory Installation GuidelinesInstalling Memory Addressing Memory With 4-GB ConfigurationsRemoving Memory CardsPCI Cards Installing a PCI CardPage Removing a PCI Card PCI Express Cards Installing a PCI Express CardPage Removing a PCI Express Card Removing the Drive Panel Drive PanelRemoving the Drive-Panel Insert Installing the Drive-Panel InsertInstalling the Drive Panel Drives Connecting Drive CablesHard Drive Drive Interface ConnectorsConnecting and Disconnecting Drive Cables Removing a Hard Drive Installing a Hard DrivePage Adding a Second Hard Drive Floppy DriveRemoving a Floppy Drive Installing a Floppy Drive Removing a Media Card Reader Media Card ReaderInstalling a Media Card Reader Removing a CD/DVD Drive CD/DVD DriveInstalling a CD/DVD Drive Page Replacing the Battery BatteryPower Supply Replacing the Power Supply Removing the Processor ProcessorInstalling the Processor Page Removing the I/O Panel PanelRemoving the Processor Fan Installing the I/O PanelProcessor Fan Installing the Processor Fan System Board Screws System BoardRemoving the System Board Installing the System Board Installing the Computer CoverBack to Contents September 2006 Rev. A00 Specifications Controls and Lights ConnectorsDrives Environmental PowerPhysical Overview System SetupEntering System Setup System Setup ScreenOnboard Devices System Setup OptionsUnlocked Bypass isNot Set Setup & Boot Menu Boot SequenceOption Settings Changing Boot Sequence for the Current BootChanging Boot Sequence for Future Boots Clearing Forgotten PasswordsFlashing the Bios Clearing Cmos SettingsClick Save this program to disk, and then click OK System Board Components Technical OverviewInside View of Your Computer Pin Number Signal name AWG Wire Power Supply DC Connector Pin AssignmentsDC Power Connector P2 DC Power Connector P10