PC auto shutdown (may not be overheating)

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KennyJo

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Jun 8, 2012
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Recently, my PC had auto shutdown because of cpu overheating.
I have cleaned the heat sink and fan and keep monitoring the CPU temp with core temp.
Now the temp ranging from 30 to 66 depend on my usage (higher temp when gaming).
However, even the CPU temp is safe, my PC still shutdown (no blue screen, shutdown instantly) from time to time, including idle.
I have even opened the case and touched every components to see if anything is too hot.
The only part was hot was the heat sink of the motherboard. And everything else, including RAM, CPU heatsink, graphics card, PSU, is kind of cool / warm.
Could some of the experts give me some advice?
Or is there anything I can do?

Thanks.

P.s. just after I finished typing this message, my PC shutdown and the temp was 33.
 
Solution
D
Did you overclock your CPU? You should check the BIOS settings to see if there isn't some kind of protection setting on. 66 degrees is still high. You can also repaste the CPU if you have some thermal compound leftover. Try also to optimize air flow in the case.

How are you sure that it is the CPU that's causing the problem?
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Deleted member 1330443

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Did you overclock your CPU? You should check the BIOS settings to see if there isn't some kind of protection setting on. 66 degrees is still high. You can also repaste the CPU if you have some thermal compound leftover. Try also to optimize air flow in the case.

How are you sure that it is the CPU that's causing the problem?
 
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KennyJo

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Jun 8, 2012
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Thank you for your reply.

I have never changed the BIO setting since I don't have any knowledge to handle it.
I have tried resetting the BIO by removing the battery for more than 2 minutes (I thought it might be the BIO problem).
I have added thermal compound (Ceramique 2) after I cleaned the fan and heatsink.
I have tried opening the case while operating the pc (I think air flow should not be a problem if I have done sth like this).
And I am sorry... I am not sure which part is causing the problem.
 
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Deleted member 1330443

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I just need to be sure if you're using a desktop or a laptop because you're talking about the case and a battery. Did you mean the Power supply. You won't be able to reset the BIOS like that because there's a battery that keeps it running. That's how your computer keeps track of time. What motherboard,CPU and heatsink are you using? How much thermal compound did you apply?
 
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KennyJo

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Jun 8, 2012
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I am using a desktop.
I removed the battery on the motherboard in order to reset the BIO.
The motherboard is Biostar A785G3.
CPU is AMD Athlon II x4 635 with the original cooling (both heatsink and fan).
I had applied almost the whole "bottle" and I had removed some of them from the CPU since I thought that was too much.

Thanks.
 
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Deleted member 1330443

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This is the problem. You actually only neeed a grain of thermal compound. It might have shorted some parts of the VRM. Reapply thermal compound correctly. Check this video:
https://www.youtube.com/watch?v=fRRWbQUqW1Y

If it is still the same after that, you'll have to consider getting a new motherboard.
 
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KennyJo

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Thanks!!
Just removed the compound and reapplied it (hope this work).
Is the chance of my motherboard being damaged high?

I hope this will not be too much for me to ask the following question:
Whenever my PC shutdown, I need to remove the cable and keep pressing the power bottom before reconnect the power cable (to reset some data?) or I will not he able to start my PC.
Is that normal?
 
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Deleted member 1330443

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No, it isn't normal. For the motherboard, because it is a cheap one, the chance of it being damaged is higher. You also need to tell me what power supply you're using.
 
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KennyJo

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I believe I need to buy a new motherboard (already 3 years and may be a good idea for some upgrade?).
Can you recommend me a motherboard?
I am having some difficulties in finding a motherboard that support AM3 socket.

Thanks.
 
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KennyJo

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Jun 8, 2012
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Thanks for the suggestion.
Is Gibabyte a good brand (better than Bio-star)?
I know Asus is a great brand but it is too expensive for me.

BTW, I am not sure if this is a coincidence or what, but my pc seems to be fine for more than 12 hours.
The only difference I know (for what I have done) is I have not started core temp.
Could this auto shutdown problem cause by software (malware, or sth like that)?

Thanks.
 
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Deleted member 1330443

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Usually, for mainstream motherboards:
Asus >= Gigabyte >= MSI >>> the rest
but it also depends on the specific motherboard.

If your PC is fine, and your CPU temperature OK, then try back up all your files. Keep using your PC until any problem arises. Virtually anything can cause the problem, but if you have a decent antivirus then you should be fine.
 
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KennyJo

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Jun 8, 2012
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The problem is solved and just in case anyone may see this post in the future (while looking for an answer for similar problem), here is what actually happened to my pc.

The reason for the whole auto shut down thing is my power supply.
Whenever I used some program required higher performance (including watching a video), or in another word, more power supply to the system, the psu would fail (overheat?) and shut the whole system down.
Even though the case of my psu was cool, the place where the fan located was actually very hot.
And I believe not enough voltage for my cpu fan was the reason why my cpu temp was so high.

For those who might be facing this problem, I strongly recommend you to check you power supply after finding applying the cooling compound do not work.

After changing my psu, my cpu temp is now ranging from 33 to 65 depending on what program/game I am using/playing.
And the auto shut down have not happened again so far.

Thanks.
 
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hafizstark

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Feb 5, 2016
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hi, i know this post is old but now i think i have the same problem

i just install new mainboard to my system Asus M5A97 R2.0 with AMD FX8320

the problem is when the pc stuck at the 'cpu fan error' press f1 to enter setup, after i enter setup and continue booting , it will turn off by itself, im assuming it is because the mobo detected that my cpu fan is not working and auto shutdown itself to prevent cpu overheating. But my cpu temperature is just around 34-45 degree.

so i turn off the cpu fan monitor. and cpu temperature to bypass the checkup

my question is, is it safe to turn off both of this monitor because my cpu temp that i monitored through speccy is just around 45-50 degree

* sorry for bad english and lengthy explanation
 
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