Bios Shows Wildly Flucuating NEGATIVE Temps

hi all,

first time posting and I am completely stumped.

About a week ago, the stock cpu fan on my secondary pc (click here for full specs starting making insane jet engine revving noises, constantly powering on and off no matter what was going on. i figured it was failing and went and bought myself a masscool aftermarket heatsink and fan. I took out the old cpu fan and replaced it with the new one and booted up the machine.

it ran well and quiet for about 25 minutes before the fan started going haywire again. i went to check out the bios and it was showing -45c/+242f and wildly fluctuating all over the place. I figured it had to do with the installation of the new heat sink so I started over, taking special special care on the work I was doing. booted back up and had the same problems. I checked the core's temps and everything seemed normal; they were showing 32c and 34c respectively.

now, after a few days of trail and error actions, other pieces of hardware are going wonky. today, it seemed as if the stock sound card failed. on another boot, it played sound. then after another, it was back out. mouse freezes up from time to time after a few minutes of basic computing. i am getting a floppy control error on every boot (for which i simply disabled the floppy device in BIOS). nothing I do seems to work; no application of thermal grease seems to solve the problem. I am truly stumped.

could the cpu temp sensor be failing? I honestly don't even know if that is a feasable problem on a computer nor do i even know what one looks like.

any help would be truly appreciated. I hate giving up and I have exhausted every idea I can think of.

ps. it should be noted that this machine is running ubuntu jaunty.

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More about bios shows wildly flucuating negative temps
  1. Ohh running odd software. I was going to suggest some better monitoring temp software, can't help you there.

    Have you threatened to add a tube style triode to it? Solder the pins in anywhere. You'll confuse it and gain the upper hand.

    Seriously, is it old? Might be a PSU problem. They do odd things when voltages get wonky.
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