Dell C521 specifications Beep Codes, Code Cause

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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