Dell E521 specifications Installing the I/O Panel, Removing the Processor Fan

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Installing the I/O Panel

1. Reconnect the cables to the I/O panel.

NOTICE: Take care not to damage the cable connectors and the cable routing clips when sliding the I/O panel into the computer.

2.Slide the I/O panel into place using the guides on the I/O panel bracket to help position the I/O panel in place, and use the notch on the I/O panel bracket to help seat the panel. Rotate the panel until the release button is secure.

3.Replace the screw that secures the I/O panel.

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

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

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

Processor Fan

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

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.

CAUTION: The heat sink assembly, power supply, and other components may be very hot during normal operation. Be sure that they have had sufficient time to cool before you touch them.

NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.

Removing the Processor Fan

1.Follow the procedures in Before You Begin.

2.Remove the computer cover (see Removing the Computer Cover).

3.Carefully disconnect and move any cables that are routed over the heat sink assembly.

4.If your computer includes a card retention mechanism to secure the x16 card in place:

a.Pivot the mechanism upward and gently squeeze in on the sides to release the mechanism from the two tab slots holding it in place.

b.Set the retention mechanism aside.

1

release tab

2

card retention mechanism

3

card retention door

5. Loosen the captive screw on each side of the heat sink assembly.

CAUTION: Despite having a plastic shield, the heat sink assembly may be very hot during normal operation. Be sure that it has had sufficient time to cool before you touch it.

NOTICE: To prevent damage to the processor, press on the heat sink assembly toward the front of the computer to help break the thermal grease bond between the heat sink and the processor.

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Contents Model Dcsm About Your Computer Front View of the ComputerBack Panel Connectors Back View of the ComputerBack to Contents Advanced Troubleshooting Power LightsDiagnostic Lights Light Pattern Problem Description Suggested ResolutionCode Cause Beep CodesSystem Messages Click the Change or Remove Program icon Diskette read failureDell Diagnostics Starting the Dell DiagnosticsDell Diagnostics Main Menu What Is a Driver?Drivers Identifying DriversReinstalling Drivers Using Windows XP Device Driver RollbackManually Reinstalling Drivers Windows XPResolving Software and Hardware Incompatibilities Click Start, then click Help and SupportBefore You Begin Getting StartedRecommended Tools Turning Off Your ComputerBack to Contents Removing and Installing Parts Removing the Computer CoverMemory Installation Guidelines MemoryAddressing Memory With 4-GB Configurations Installing MemoryCards Removing MemoryInstalling a PCI Card PCI CardsPage Removing a PCI Card Installing a PCI Express Card PCI Express CardsPage Removing a PCI Express Card Drive Panel Removing the Drive PanelRemoving the Drive-Panel Insert Installing the Drive-Panel InsertInstalling the Drive Panel Connecting Drive Cables DrivesHard Drive Drive Interface ConnectorsConnecting and Disconnecting Drive Cables Installing a Hard Drive Removing a Hard DrivePage Floppy Drive Adding a Second Hard DriveRemoving a Floppy Drive Installing a Floppy Drive Media Card Reader Removing a Media Card ReaderInstalling a Media Card Reader CD/DVD Drive Removing a CD/DVD DriveInstalling a CD/DVD Drive Page Replacing the Battery BatteryPower Supply Replacing the Power Supply Processor Removing the ProcessorInstalling the Processor Page Panel Removing the I/O PanelRemoving the Processor Fan Installing the I/O PanelProcessor Fan Installing the Processor Fan System Board Screws System BoardRemoving the System Board Installing the Computer Cover Installing the System BoardBack to Contents September 2006 Rev. A00 Specifications Controls and Lights ConnectorsDrives Environmental PowerPhysical System Setup Entering System SetupSystem Setup Screen OverviewSystem Setup Options Onboard DevicesUnlocked Bypass isNot Set Boot Sequence Option SettingsChanging Boot Sequence for the Current Boot Setup & Boot MenuClearing Forgotten Passwords Changing Boot Sequence for Future BootsClearing Cmos Settings Flashing the BiosClick Save this program to disk, and then click OK System Board Components Technical OverviewInside View of Your Computer Power Supply DC Connector Pin Assignments Pin Number Signal name AWG WireDC Power Connector P2 DC Power Connector P10