Dell OptiPlex 320 Quick Reference Manual page 36

Light Pattern Problem Description
No memory modules are detected.
Memory modules are detected, but a
memory configuration or compatibility
error exists.
A failure has occurred.
This pattern also displays when you enter
system setup and may not indicate a
problem.
After POST is complete, all four
diagnostic lights turn green briefly before
turning off to indicate a normal operating
condition.
36
Quick Reference Guide
Suggested Resolution
• If you have one memory module installed,
reinstall it and restart the computer. For
information on reinstalling memory
modules, see your online User's Guide.
• 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. For
information on contacting Dell, see your
online User's Guide.
• Ensure that no special memory
module/memory connector placement
requirements exist.
• Verify that the memory modules that you
are installing are compatible with your
computer.
• If the problem persists, contact Dell. For
information on contacting Dell, see your
online User's Guide.
• Ensure that the cables are properly
connected to the system board from the
hard drive, CD drive, and DVD drive.
• Check the computer message that appears
on your monitor screen.
• If the problem persists, contact Dell. For
information on contacting Dell, see your
online User's Guide.
None.