Dell E521 specifications Removing the I/O Panel

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11.Connect any cables disconnected before removing the heat sink assembly.

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

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

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

I/O Panel

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 I/O Panel

NOTE: Note the routing of all cables as you remove them so that you can re-route them correctly when installing the new I/O panel.

1.Follow the procedures in Before You Begin.

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

NOTICE: When sliding the I/O panel out of the computer, be extremely careful. Carelessness my result in damage to the cable connectors and the cable routing clips.

3.Remove the screw that secures the I/O panel. Press on the release button and slide the card away from the front of the computer.

4.Carefully remove the panel from the computer.

5.Disconnect all of the cables from the I/O panel.

1

I/O panel release button

2

securing screw

3

I/O panel

 

 

 

 

 

 

4

I/O cable connector

 

 

 

 

 

 

 

 

 

 

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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 LightsSystem Messages Beep CodesCode Cause 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 PanelInstalling the Drive Panel Installing the Drive-Panel InsertRemoving the Drive-Panel Insert Drives Connecting Drive CablesConnecting and Disconnecting Drive Cables Drive Interface ConnectorsHard Drive 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 Power Supply BatteryReplacing the Battery Replacing the Power Supply Removing the Processor ProcessorInstalling the Processor Page Removing the I/O Panel PanelProcessor Fan Installing the I/O PanelRemoving the Processor Fan Installing the Processor Fan Removing the System Board System BoardSystem Board Screws Installing the System Board Installing the Computer CoverBack to Contents September 2006 Rev. A00 Specifications Drives ConnectorsControls and Lights Physical PowerEnvironmental Overview System SetupEntering System Setup System Setup ScreenOnboard Devices System Setup OptionsNot Set Bypass isUnlocked 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 Inside View of Your Computer Technical OverviewSystem Board Components Pin Number Signal name AWG Wire Power Supply DC Connector Pin AssignmentsDC Power Connector P2 DC Power Connector P10