Dell C521 specifications Beep Codes, Code Cause

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A possible USB failure has occurred.

Reinstall all USB devices, check cable connections, and then restart the computer.

 

 

 

 

No memory modules are detected.

If you have two or more memory modules installed, remove the modules, reinstall

 

 

one module (see Memory), and then restart the computer. If the computer starts

 

 

normally, reinstall an additional module. Continue until you have identified a faulty

 

 

module or reinstalled all modules without error.

 

 

If available, install properly working memory of the same type into your computer

 

 

(see Memory).

 

 

If the problem persists, contact Dell. For information about contacting Dell, see your

 

 

Owner's Manual.

 

 

 

 

Memory modules are detected, but a memory

Ensure that no special memory module/memory connector placement requirements

 

configuration or compatibility error exists.

exist (see Memory).

 

 

Verify that the memory modules that you are installing are compatible with your

 

 

computer (see Memory).

 

 

If the problem persists, contact Dell. For information about contacting Dell, see your

 

 

Owner's Manual.

 

 

 

 

A possible expansion card failure has

1. Determine whether a conflict exists by removing a card and restarting the computer

 

occurred.

(see Cards).

 

 

2. If the problem persists, reinstall the card that you removed, remove a different card,

 

 

and then restart the computer.

 

 

3. Repeat this process for each card. If the computer starts normally, troubleshoot the

 

 

last card removed from the computer for resource conflicts.

 

 

4. If the problem persists, contact Dell. For information about contacting Dell, see your

 

 

Owner's Manual.

 

 

 

 

Routine system activity subsequent to video

Watch your monitor for on-screen messages.

 

initialization.

 

 

 

 

 

System resource configuration in progress.

None.

 

 

 

 

System board failure has occurred.

Contact Dell. For information about contacting Dell, see your Owner's Manual.

 

 

 

 

During normal operation, all of the diagnostic

If the system does not start, plug the computer into a working electrical outlet. Also see

 

lights turn on and then turn off before the

System Lights.

 

system starts.

 

 

 

If there are no power problems and the system does not start, contact Dell. For information

 

 

about contacting Dell, see your Owner's Manual.

 

NOTE: If all of the diagnostic lights are on

 

 

and the system does not start, there may be

 

 

a problem with the power supply or with the

 

 

processor.

 

 

 

 

Beep Codes

Your computer might emit a series of beeps during start-up if the monitor cannot display errors or problems. This series of beeps, called a beep code, identifies a problem. One possible beep code consists of one long beep and then two short beeps. This beep code tells you that the computer encountered a memory test failure.

If your computer beeps during start-up:

1.Write down the beep code on the Diagnostics Checklist. The Diagnostics Checklist is located in your Owner's Manual.

2.Run the Dell Diagnostics to identify a more serious cause. See Dell Diagnostics.

3.Contact Dell for technical assistance. For information about contacting Dell, see your Owner's Manual.

Code

Cause

 

2 short, 1 long

BIOS checksum error

 

 

 

 

1 long, 2 short

Memory test failure (bad memory during memory sizing)

 

 

 

 

1 long, 3 short, 2 short

No memory

 

 

 

 

1 short

F12 key pressed

 

 

 

 

 

 

 

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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 Recommended Tools Before You BeginGetting Started Turning Off Your ComputerPage Replacing the Computer Cover Removing the Computer Cover DDR2 Memory Overview Removing and Installing PartsMemory Installing Memory Cards Removing MemoryInstalling an Expansion Card Removing an Expansion Card Drives Power Cable Connector General Installation GuidelinesDrive Interface Connectors Connecting and Disconnecting Drive CablesRemoving a CD/DVD Drive Installing a CD/DVD DriveCD/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 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 Overview System SetupEntering System Setup OverviewSystem Setup Options System64MB Boot Menu Post BehaviorClearing Forgotten Passwords and Cmos Settings Jumper Locations Clearing Password SettingsFlashing the Bios Clearing Cmos SettingsSystem Board Components Technical OverviewInside View of Your Computer Jumper Settings Jumper Setting DescriptionPin Number Signal name AWG Wire Power Supply DC Connector Pin AssignmentsDC Power Connector P1 DC Power Connector P4 DC Power Connector P2DC Power Connector P3 DC Power Connector P5 and P6Black +12 VDC Yellow September 2006 Rev. A00 When to Use the Dell Diagnostics TroubleshootingDell Diagnostics Dell Diagnostics Main MenuProblem Description Suggested Resolution Diagnostic LightsPower Light Problem Description Suggested Resolution System LightsBeep Codes Code Cause