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38 Setup and Quick Reference Guide
www.dell.com | support.dell.com
A possible microprocessor
failure has occurred.
Reinstall the microprocessor and restart the computer.
Memory modules are
detected, but a memory
failure has occurred.
1 Reset the memory modules to ensure that your
computer is successfully communicating with the
memory.
2 Restart the computer.
3 If the problem still exists, remove all the memory
modules and install one memory module in
memory module connector 4.
4 Restart the computer.
The following message appears: Alert!
Operating in Debug Mode. Please
Populate Memory in Pairs for Normal
Operation.
5 Press <F1> to boot to the operating system.
6 Run the System Memory test group in the Dell
Diagnostics.
7 If the memory module passes, shut down the
computer, remove the memory module, and repeat
the process with the remaining memory modules
until a memory error occurs during start-up or
diagnostic testing.
If the first memory module tested is defective,
repeat the process with the remaining modules to
ensure that the remaining modules are not
defective.
8 When the defective memory module is identified,
contact Dell for a replacement.
NOTE: If necessary, the computer can operate in
debug mode until new memory modules are installed.
Light Pattern Problem Description Suggestion Resolution
= yellow
= green
= off
A B C D
A B C D