• If the problem persists, the system board is faulty.
LED
Power Button
Problem Description
A possible coin cell battery failure has occurred.
Troubleshooting Steps Remove the coin cell battery for one minute, reinstall
the battery, and restart.
LED
Power Button
Problem Description
A possible processor failure has occurred.
Troubleshooting Steps
Re-seat the processor.
LED
Power Button
Problem Description Memory modules are detected, but a memory failure has
occurred.
Troubleshooting
Steps
• 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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Summary of Contents for OptiPlex 990 Desktop
Page 6: ...23 Contacting Dell 93 Contacting Dell 93 ...
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Page 41: ...16 Remove the system board from the chassis 41 ...
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