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CMOS battery not working and CPU fan sensor not detecting fan.

Last response: in Motherboards
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May 2, 2011 7:00:08 AM

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?
a c 1097 V Motherboard
May 2, 2011 8:29:25 AM

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.
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May 2, 2011 8:35:37 AM

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.
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a c 1097 V Motherboard
May 2, 2011 8:43:28 AM

By your description it sounds like the board is bad. It is important that you check with the motherboard manual that you have that jumper you added in the right spot.
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May 2, 2011 8:47:19 AM

Yes, little diagram in white showing where the jumper should be, I placed it in the appropriate position.
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a b V Motherboard
May 2, 2011 4:00:49 PM

Try reflashing the bios.
Is that feasible?

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May 2, 2011 7:56:34 PM

Sorry to sound like a newbie, but how do I do that?
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a b V Motherboard
May 3, 2011 12:10:34 PM

Check the motherboard manual or the manufacturer of the motherboard's website.

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May 5, 2011 3:53:58 AM

Ok, I reflashed the bios with the latest version (was already the latest), and it is still showing the same things in the bios sadly :( 
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a c 1097 V Motherboard
May 15, 2011 5:50:40 PM

Bad board!
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May 16, 2011 3:39:47 AM

OK, I think I can live with it though.
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!