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40 Setup and Quick Reference Guide
www.dell.com | support.dell.com
No memory modules are
detected.
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.
System board failure has
occurred.
Perform the procedures in "System Board Problems" in
your User’s Guide.
If the problem persists, contact Dell.
Light Pattern Problem Description Suggestion Resolution
= yellow
= green
= off
A B C D
A B C D