Dell C521 specifications DC Power Connector P2, DC Power Connector P3, DC Power Connector P4

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23	VCC (+5V)	Red

24	GND	Black

*Use 22-AWG wire instead of 18-AWG wire.

DC Power Connector P2

Pin Number Signal Name 18-AWG Wire

1	COM	Black
2	COM	Black

3	+12 VDC	Yellow

4	+12 VDC	Yellow

DC Power Connector P3

Pin Number Signal name 18-AWG Wire

1	+12VDC	Yellow
2	COM	Black

3	COM	Black

4	+5 VDC	Red

DC Power Connector P4

Pin Number Signal Name 22-AWG Wire

1	+5 VCD	Red
2	COM	Black

3	COM	Black

4	+12 VDC	Yellow

DC Power Connector P5 and P6

Pin Number Signal name 18-AWG Wire

1	+3.3 VDC	Orange
2	COM	Black

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Contents September 2006 Rev. A00 Front View About Your ComputerBack View of the Computer Back Panel I/O ConnectorsBack to Contents Getting Started Before You BeginRecommended Tools Turning Off Your ComputerPage Replacing the Computer Cover Removing the Computer Cover Removing and Installing Parts MemoryDDR2 Memory Overview Installing Memory Removing Memory CardsInstalling an Expansion Card Removing an Expansion Card Drives Drive Interface Connectors General Installation GuidelinesPower Cable Connector Connecting and Disconnecting Drive CablesInstalling a CD/DVD Drive CD/DVD DriveRemoving a CD/DVD Drive Removing a Floppy Drive Floppy DriveInstalling a Floppy Drive Removing a Media Card Reader Media Card ReaderInstalling a Media Card Reader Removing a Hard Drive Hard DriveInstalling a Hard Drive Replacing the Battery BatteryRemoving the Processor ProcessorInstalling the Processor Page Replacing the Power Supply Power SupplyRemoving the Front I/O Panel Front I/O PanelFan Assembly Installing the Front I/O PanelRemoving the Fan Assembly Installing the Fan Assembly System BoardRemoving the System Board Replacing the System Board Page Specifications Connectors DrivesControls and Lights Power PhysicalEnvironmental Entering System Setup System SetupOverview OverviewSystem System Setup Options64MB Post Behavior Boot MenuJumper Locations Clearing Password Settings Clearing Forgotten Passwords and Cmos SettingsClearing Cmos Settings Flashing the BiosTechnical Overview Inside View of Your ComputerSystem Board Components Jumper Setting Description Jumper SettingsPower Supply DC Connector Pin Assignments DC Power Connector P1Pin Number Signal name AWG Wire DC Power Connector P3 DC Power Connector P2DC Power Connector P4 DC Power Connector P5 and P6Black +12 VDC Yellow September 2006 Rev. A00 Dell Diagnostics TroubleshootingWhen to Use the Dell Diagnostics Dell Diagnostics Main MenuPower Light Problem Description Suggested Resolution Diagnostic LightsProblem Description Suggested Resolution System LightsCode Cause Beep Codes