Dell OptiPlex 390 Small Form Factor Owner's Manual page 73

If available, install working memory of the same type
Memory modules are detected, but a memory
. configuration or compatibility error has occurred
Ensure that no special requirements for memory
. module/connector placement exist
Ensure that the memory you are using is supported
. A possible expansion card failure has occurred
Determine if a conflict exists by removing an
expansion card (not a graphics card) and restarting
If the problem persists, reinstall the card you
removed, then remove a different card and restart
Repeat this process for each expansion card
installed. If the computer starts normally,
troubleshoot the last card removed from the
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. into your computer
. by your computer
. computer for resource conflicts
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Troubleshooting Steps
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. the computer
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. the computer
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LED
Power Button
Problem Description
LED
Power Button
Problem Description
Troubleshooting
Steps
LED