Dell OptiPlex 330 (Late 2007) - Manual (Page 132)

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No memory modules are detected. l If you have one memory module installed, reinstall it and restart the computer. See
Memory for instructions on how to remove and install memory modules.
l 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.
l If available, install properly working memory of the same type into your computer.
l If the problem persists, contact Dell (see Contacting Dell ).
Memory modules are detected, but a
memory configuration or compatibility error
exists. l Ensure that no special memory module/memory connector placement requirements
exist (see Memory ).
l Verify that the memory modules that you are installing are compatible with your
computer (see Memory ).
l If the problem persists, (see Contacting Dell ).
A failure has occurred.
This pattern also displays when you enter
system setup and may not indicate a
problem (see
System Setup ).
l Ensure that the cables are properly connected to the system board from the hard drive
and the optical drive.
l Check the computer message that appears on your monitor screen.
l If the problem persists, (see Contacting Dell ).
After POST is complete, all four diagnostic
lights turn green briefly before turning off
to indicate normal operating condition. None.