Beep Codes - Dell Dimension C521 Service Manual

A possible USB failure has occurred.
No memory modules are detected.
Memory modules are detected, but a memory
configuration or compatibility error exists.
A possible expansion card failure has
occurred.
Routine system activity subsequent to video
initialization.
System resource configuration in progress.
System board failure has occurred.
During normal operation, all of the diagnostic
lights turn on and then turn off before the
system starts.
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
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
Back to Contents Page
Reinstall all USB devices, check cable connections, and then restart the computer.
If you have two or more memory modules installed, remove the modules, reinstall
l
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
l
(see Memory).
If the problem persists, contact Dell. For information about contacting Dell, see your
l
Owner's Manual.
Ensure that no special memory module/memory connector placement requirements
l
exist (see Memory).
Verify that the memory modules that you are installing are compatible with your
l
computer (see Memory).
If the problem persists, contact Dell. For information about contacting Dell, see your
l
Owner's Manual.
1. Determine whether a conflict exists by removing a card and restarting the computer
(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.
Watch your monitor for on-screen messages.
None.
Contact Dell. For information about contacting Dell, see your Owner's Manual.
If the system does not start, plug the computer into a working electrical outlet. Also see
System Lights.
If there are no power problems and the system does not start, contact Dell. For information
about contacting Dell, see your Owner's Manual.
Dell Diagnostics.