I have an MPG Z39M motherboard, and my PC used to start up just fine. The CMOS battery died, which caused the BIOS to reset, but the PC was still running normally until last night. After I turned it off to sleep, it wouldn't power on today. I tried hard resetting, unplugging the GPU, and checking all the connections, but no luck. Could the dead CMOS battery be the root of this issue, or do I need to consider that my power supply might have failed unexpectedly?
4 Answers
In my experience, a dead CMOS battery has caused boot issues before, but it usually doesn't prevent the PC from turning on. It just resets time and BIOS settings every time you power it off. But if you're seeing nothing happen when you try to turn it on, look elsewhere.
I've had similar issues, where my dead CMOS battery stopped my old ASRock Z97 from booting into the OS. It can be tricky, but if you've already tried testing the PSU and it passed, you might want to consider that the motherboard or CPU could be failing instead. Maybe it's time for an upgrade if you can swing it.
Since you've ruled out the PSU and switched the CMOS battery, it seems like the power button might be the culprit. I figured out that the physical power button was faulty in a previous case. You can try using a different button, like the reset switch, to see if that helps until you find a proper replacement.
Generally, a dead CMOS battery shouldn't stop your PC from powering on at all; it might cause some boot issues or lose BIOS settings, but you should still see some signs of life. If it won't turn on at all, it might be something else at play.
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