Dell C521 specifications Clearing Forgotten Passwords and Cmos Settings

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1.Enter system setup, select Boot Sequence from the System group. See System Setup Options.

2.Press <Enter> to access the menu.

NOTE: Write down your current boot sequence in case you want to restore it.

3.Press the up- and down-arrow keys to highlight the appropriate Boot Sequence option.

4.Press the U or D key to move the option up or down in the boot sequence.

5.Press <Enter> to Save the changes or <Esc> to Cancel.

Clearing Forgotten Passwords and CMOS Settings

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

Jumper Locations

Clearing Password Settings

1.Follow the procedures in Before You Begin.

2.Locate the 2-pin password jumper (PSWD) on the system board (see Jumper Locations), and attach the jumper plug to pins 1 and 2 to clear the password.

NOTE: When you receive your computer, the jumper plug is attached to pin 1.

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

4.Connect your computer and monitor to electrical outlets, and then turn them on.

5.After the Microsoft® Windows® desktop appears on your computer, shut down the computer. See Turning Off Your Computer.

6.Turn off the monitor and disconnect it from the electrical outlet.

7.Disconnect the computer power cable from the electrical outlet, then press the power button to ground the system board.

8.Remove the computer cover. See Replacing the Computer Cover.

9.Locate the 2-pin password jumper (PSWD) on the system board and attach the jumper to pin 1 to reenable the password feature.

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

NOTICE: To connect a network cable, first plug the cable into the network port or device, and then plug it into the computer.

11. Connect your computer and devices to electrical outlets, and then turn them on.

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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 ProcessorInstalling 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