Dell OptiPlex 390, Quick Reference Manual, Page: 38 / 190

38
Quick Reference Guide
A possible BIOS failure has occurred;
the computer is in the recovery mode. Run the BIOS Recovery utility, wait for
recovery completion, and then restart
the computer.
A possible processor failure
has occurred. Reinstall the processor and restart
the computer.
Memory modules are detected,
but a memory failure has occurred.
1
Reseat 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 Dell Diagnostics. See page 34
for instructions.
7
If the memory module passes, shut
down the computer, remove the
memory module, and then 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. For instructions on
contacting Dell, see your
User’s Guide .
NOTE:
If necessary, the computer can
operate in debug mode until new memory
modules are installed.
Light Pattern Problem Description Suggested Resolution