CMOS battery not working and CPU fan sensor not detecting fan.
I recently got a motherboard (second hand) and all is working well except three things: The BIOS battery doesn't seem to work. The CPU fan doesn't show proper temps or speeds in BIOS. And the PSU voltage rails are showing weird voltages. I recently found that the motherboard didn't have a jumper on the bios pins so I put it on 2-3 (normal on my mobo) and it still doesn't seem to work after replacing the battery. The next thing is that in the BIOS the temps are shown as 1 degree Celsius and the fan speed as 0 RPM. Lastly, the rails are showing weird voltages (16v on 12v rail etc) and I would really like to get these fixed, could someone please help me out?
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Broken board bad PSU? Those are the questions you need answered. Most importantly you need to know if the PSU is really sending out +16volts instead of +12. A multimeter would be able to measure that in a spare molex.
Hi, thanks for the reply. The PSU is a 400w CoolerMaster that I got 2 years ago and has just started showing these voltages since I changed mobo. I read once, if a mobo would ever reach 16v, it would shut itself down to prevent damage, but the board seems fine.