Dell C521 specifications Removing the Front I/O Panel

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1 release button

2 power supply

3 screws (2)

4AC power connector

5.Slide the power supply toward the front of the computer and lift the power supply up and out of the computer.

6.Lower the replacement power supply into the computer.

7.Slide the replacement power supply toward the back of the computer until it snaps into place.

8.Replace the screws that secure the power supply to the back of the computer chassis.

9.Reconnect the DC power cables.

10.Replace the computer cover. See Replacing the Computer Cover.

11.Connect the AC power cable to the AC power connector.

Front I/O Panel

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

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

Removing the Front I/O Panel

1.Follow the procedures in Before You Begin.

2.Remove the computer cover. See Removing the Computer Cover.

3.Loosen the captive screw on each side of the heat sink assembly. See Removing the Processor.

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 avoid damaging the processor or processor socket, slide the heat sink assembly forward and backwards to break the thermal grease seal between the processor and heat sink. If you do not break the seal first, the processor may stick to the heat sink assembly while rotating the assembly upward.

4.Slide the heat sink assembly forward and backwards to break the thermal grease seal.

5.Rotate the heat sink assembly upward.

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Contents September 2006 Rev. A00 About Your Computer Front ViewBack Panel I/O Connectors Back View of the ComputerBack to Contents Before You Begin Getting StartedRecommended Tools Turning Off Your ComputerPage Replacing the Computer Cover Removing the Computer Cover Memory Removing and Installing PartsDDR2 Memory Overview Installing Memory Cards Removing MemoryInstalling an Expansion Card Removing an Expansion Card Drives General Installation Guidelines Drive Interface ConnectorsPower Cable Connector Connecting and Disconnecting Drive CablesCD/DVD Drive Installing a CD/DVD DriveRemoving a CD/DVD Drive Floppy Drive Removing a Floppy DriveInstalling a Floppy Drive Media Card Reader Removing a Media Card ReaderInstalling a Media Card Reader Hard Drive Removing a Hard DriveInstalling a Hard Drive Battery Replacing the BatteryProcessor Removing the Processor Installing the Processor Page Power Supply Replacing the Power SupplyFront I/O Panel Removing the Front I/O PanelInstalling the Front I/O Panel Fan AssemblyRemoving the Fan Assembly System Board Installing the Fan AssemblyRemoving the System Board Replacing the System Board Page Specifications Drives ConnectorsControls and Lights Physical PowerEnvironmental System Setup Entering System SetupOverview OverviewSystem Setup Options System64MB Boot Menu Post BehaviorClearing Forgotten Passwords and Cmos Settings Jumper Locations Clearing Password SettingsFlashing the Bios Clearing Cmos SettingsInside View of Your Computer Technical OverviewSystem Board Components Jumper Settings Jumper Setting DescriptionDC Power Connector P1 Power Supply DC Connector Pin AssignmentsPin Number Signal name AWG Wire DC Power Connector P2 DC Power Connector P3DC Power Connector P4 DC Power Connector P5 and P6Black +12 VDC Yellow September 2006 Rev. A00 Troubleshooting Dell DiagnosticsWhen to Use the Dell Diagnostics Dell Diagnostics Main MenuDiagnostic Lights Power Light Problem Description Suggested ResolutionProblem Description Suggested Resolution System LightsBeep Codes Code Cause