CPU temperature right in OS wrong in BIOS, help?

Hey folks,

It's been a while since I've posted but I'm always around! I need some help if anyone can offer any input.

I have an eMachines 1401 it's an all in one mini desktop jobby. I took it apart earlier to nab a stick of memory from it, it was a bit fiddly but I got there in the end with no issues.

I then put it back together which seemed more awkward then taking it apart, I applied a bit more force than usual if I am to hold my hands up, this is where I think it's gone wrong!

There is one heatsink which covers both the CPU and GPU chip, I had to take it off to take it apart so I resat the heatsink with some fresh thermal paste and monitored the temps when it was back together, the temps soard to 100 celcius (I left it for a few mins before noticing) I instantly turned it off and unplugged it. I then later tried to reseat the heatsink again with some new thermal paste as the thermal paste I used originally had been in the draw for a while.

However I've now found out after some elimination that the BIOS shows the CPU temp at -70 celcius where as the GPU temp is correct, however it get's a bit strange, XBMC shows a temperature reading for the CPU (which seems right) but my BIOS doesn't it just constantly shows -70 celcius. I need the BIOS to recognise it for the SMART fan control to work as if I don't have smart it constantly runs at 4000 RPM which is very noisy!

Any suggestions?

I'll try clearing the CMOS but I'm not sure if that will have any effect.

I wonder if the high temp has fried a bit of it.

Maybe the sensor is damaged now. 100 deg on a CPU might not been good no matter if its Intel or AMD.

Does the PC slow down at all, like the CPU is throttling back?

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Originally Posted by DannyM

Hey folks,

It's been a while since I've posted but I'm always around! I need some help if anyone can offer any input.

I have an eMachines 1401 it's an all in one mini desktop jobby. I took it apart earlier to nab a stick of memory from it, it was a bit fiddly but I got there in the end with no issues.

I then put it back together which seemed more awkward then taking it apart, I applied a bit more force than usual if I am to hold my hands up, this is where I think it's gone wrong!

There is one heatsink which covers both the CPU and GPU chip, I had to take it off to take it apart so I resat the heatsink with some fresh thermal paste and monitored the temps when it was back together, the temps soard to 100 celcius (I left it for a few mins before noticing) I instantly turned it off and unplugged it. I then later tried to reseat the heatsink again with some new thermal paste as the thermal paste I used originally had been in the draw for a while.

However I've now found out after some elimination that the BIOS shows the CPU temp at -70 celcius where as the GPU temp is correct, however it get's a bit strange, XBMC shows a temperature reading for the CPU (which seems right) but my BIOS doesn't it just constantly shows -70 celcius. I need the BIOS to recognise it for the SMART fan control to work as if I don't have smart it constantly runs at 4000 RPM which is very noisy!

Any suggestions?

I'll try clearing the CMOS but I'm not sure if that will have any effect.

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What paste are you using? If its generic in brand i would try something like arctic silver and see how your temps are with that.

Right so here is an update.

I tried resetting BIOS and updating it, that didn't work. I tried re-seating the heatsink using some new thermal paste that didn't work. I tried a thorough clean of the CPU I did this gently and cautiously, that didn't work. So I'm just going to assume I did physically damage it.

I can still use it but it requires running the fan flat out and if the sensor is broke I'd have no true way to monitor the temperature.

Thanks for your input but I think it's safe to say it's a goner.

Are you sure Windows is reporting the same sensor as the BIOS? Eg. some PC's have a motherboard or ambient case temp, which may be what's being reported in Windows whereas the BIOS is reporting the CPU which has been damaged.

To help with your fan problem, broadly you could try plugging the fan into a different header, using a fan controller, or even a DIY resistor job, all to slow the fan. The downside is then that the fan's won't speed up if the temps rise.

Not really any solution above as such, but hope the further exploration of the problem and routes to success help.