Dell OptiPlex 390 Owner's Manual page 71

LED
Power Button
Problem Description
Troubleshooting Steps Remove the coin cell battery for one minute, reinstall
LED
Power Button
Problem Description
Troubleshooting Steps
LED
Power Button
Problem Description Memory modules are detected, but a memory failure has
Troubleshooting
Steps
• If the problem persists, the system board is faulty.
A possible coin cell battery failure has occurred.
the battery, and restart.
A possible processor failure has occurred.
Re-seat the processor.
occurred.
• If two or more memory modules are installed,
remove the modules, then re-install one module and
re-start the computer. If the computer starts
normally, continue to install additional memory
modules (one at a time) until you have identified a
faulty module or reinstalled all modules without
error.
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