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332 Troubleshooting Tools and Utilities
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.
No memory modules are detected.
•If you have one memory module
installed, reinstall it and restart the
computer (see "Memory" on page 291 for
instructions on how to remove and
install memory modules).
• If you have two or more memory
modules installed, remove the modules,
reinstall one module, 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.
• If the problem persists,
contact Dell
.
Memory modules are detected, but a
memory configuration or compatibility
error exists.
• Ensure that no
special memory
module/memory connector placement
requirements
exist (see "Memory" on
page 291).
• Verify that the
memory modules
that
you are installing are compatible with
your computer.
• If the problem persists,
contact Dell
.
A failure has occurred.
This pattern also displays when you enter
system setup and may not indicate a
problem (see "Entering System Setup" on
page 257).
• Ensure that the cables are properly
connected to the system board from the
hard drive, and optical drive.
• Check the computer message that
appears on your monitor screen.
• If the problem persists,
contact Dell
.
After POST is complete, all four
diagnostic lights turn green briefly before
turning off to indicate normal operating
condition.
None.
Light Pattern Problem Description Suggested Resolution