CMOS battery problem

Situation

Desktop PC stops working for no apparent reason. Doesn’t power on.

Troubleshooting

Tested power supply, power button, CPU, RAM, all fine.

Solution

CMOS battery! PC would boot if the battery was removed. With the battery inserted the system wouldn’t power on. Replaced the CMOS battery, but the problem persisted. Perhaps there is corrosion somewhere near the battery socket which causes this. I just left the battery out.

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