Dell C521 specifications Flashing the Bios, Clearing Cmos Settings

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Clearing CMOS Settings

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

1.Follow the procedures in Before You Begin.

2.Reset the current CMOS settings:

a.Locate the 2-pin CMOS jumper (RTCRST) on the system board. See Jumper Locations.

b.Remove the jumper plug from pin 1.

c.Place the jumper plug on pins 1 and 2 and wait approximately five seconds.

d.Replace the jumper plug on pin 1.

3.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.

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

Flashing the BIOS

The BIOS may require a new flash when an update is available or when replacing the system board.

1.Turn on the computer.

2.Locate the BIOS update file for your computer at support.dell.com.

3.Click Download Now to download the file.

4.If the Export Compliance Disclaimer window appears, click Yes, I Accept the Agreement.

The FIle Download window appears.

5.Click Save this program to disk and then click OK.

The Save In window appears.

6.Click the down arrow to view the Save In menu, select Desktop, and then click Save.

The file downloads to your desktop.

7.Click Close when the Download Complete window appears.

The file icon appears on your desktop and is titled the same as the download BIOS update file.

8.Double-click the file icon on the desktop and follow the on-screen instructions.

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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 DDR2 Memory Overview Removing and Installing PartsMemory 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 CablesRemoving a CD/DVD Drive Installing a CD/DVD DriveCD/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 PanelRemoving the Fan Assembly Fan AssemblyInstalling the Front I/O Panel Removing the System Board Installing the Fan AssemblySystem Board Replacing the System Board Page Specifications Controls and Lights ConnectorsDrives Environmental PowerPhysical 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 BiosSystem Board Components Technical OverviewInside View of Your Computer Jumper Setting Description Jumper SettingsPin Number Signal name AWG Wire Power Supply DC Connector Pin AssignmentsDC Power Connector P1 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