Overheating CPU

The other night i shut my computer off normally and woke to a computer that would start for about 5 minutes then overheat.

So naturally i took off the case felt around and the area around the CPU was hot as the dickens. So I then proceded to remove the heat sink, clean it off aswell as the processor and re applied some new Thermal compound, just a pea sized drop and reseated the Heatsink. Avast, no change. I had just enough time to grab a picture of SpeedFan on my phone before the computer shut down to prevent serious damage.

I am running a Asus mobo with an AMD K8 Sempron Dual Core 2 gigs of ram and a EVGA Geforce 9500 GT, also a 640w PSU

After re-applying a few times and re seating the Heatsink, nothing so i sanded the bottom of the heatsink with rough sandpaper in a figure 8 to assure level-ness and used 3 more finer sand paper pieces to make sure it was smooth, then re applied and no avail yet again. I have looked in the bios for temperatures but it doesnt have an option for that.


The fan runs that speed to keep up with the heat, i dont understand what could be causing this issue from nothing.

That speedfan picture is the only thing running at the time, i have tried opening in Safemode but still overheats so it isnt a startup program causing it. It even overheats in the BIOS.

Im a software Programmer so i have little knowledge of the skeleton other than basic computer components.
60 answers Last reply
More about overheating
  1. your cpu usage is 100%, something is running.
  2. Speedfan and system idle. That's it. I checks processes and services. Nothing else.
  3. Well try running windows task manager and post a picture of the entire process list. It could also be malware causing the computer to run at 100%.
  4. But it does this in the BIOS aswell.
  5. What did the temperatures in the bios say? If it were high then I would suspect an incorrectly installed heatsink or its inadequate for your CPU.
  6. The BIOS doesn't give me the option to check temperatures. Also there isn't from what I see an incorrect way to install the heatsink it is just a switch clip and this is the same one I have used for quite a while. I'm not overclocked or anything.
  7. It is strange that your CPU is at 100%. Maybe windows is installing an update behind the scenes. That may tax your sempron CPU. Hvae you tried to dust out your pc with some compressed air? Maybe the heatsink is full of dust or other crap.
  8. Yes I have. I have an air compressor for that.
  9. since it happens in the bios as well, have you tried resetting the bios or removing the cmos battery for a few minutes?
  10. Yes I have. I also removed the mobo aswell to make sure that the heatsink was seated properly
  11. Well what kind of CPU cooler are you using? If you were using something real bad that may cause those temperatures. Honestly, I am quite puzzled by the 100% load and high temperatures when you are doing nothing. Do you have one of those thermal guns? If so try pointing it any part of the exposed CPU or just on the heatsink base, you will get a temperature that wont be the same as the real temperature but it will give you a general idea of what it is actually like. It could also be a faulty temperature sensor.
  12. I'm going to try that right now and I will post an update in a few minutes
  13. I just checked it and it came up with 44.3 degrees Celsius. And at that degree it shut off. this was while detecting the heatsink
  14. I have an open right now and it's running at 65 Celsius for my temp 3 witches my CPU the fan is running at 4500 rpm and my radar sensor reads 50 degrees Celsius
  15. That is quite hot, if that is what the heatsink is experiencing then I suppose the CPU itself is much hotter! Do you have an alternate heatsink to switch to? Also what is the CPU cooler model? Is it the stock one or is it aftermarket?
  16. Its stock. I just loaded windows normally with no startup programs and the heatdink was at 54 celcuous
  17. I also have noticed that whenever I'm running Windows and it shuts down like that I have to reseat the graphics card for it to work again
  18. Is there major dust issues in your case aside from the heatsink? You also stated you sanded the heatsink, did you make sure it was a mirror finish or at least smooth without any major scratches?
  19. It is your PSU causing the issue. Have it changed and your problems will go away
  20. There is no dust in the case whatsoever I made sure of that the first time it started overheating. And is there a possible way that I could know if it was the power supply or not
  21. Also yes I made sure there was it was a mirrored finish and I'm sorry for all the post but it's hard to manage everything through an Android
  22. What is it possible that sending too much power through the boarding it's feeding back into the processor. I just took out my PSU and it's actually very warm
  23. Just the graphics card and the new Thermaltake 430 watt PSU that is it
  24. Not sure if you can test the PSU yourself You could take out the PSU and find a PC shop to test it for you.

    Or, you can just do some research and find a PSU that's compatible with your PC.

    Have you ever changed any hardware on the PC before ?
  25. jonnysimcoe said:
    What is it possible that sending too much power through the boarding it's feeding back into the processor. I just took out my PSU and it's actually very warm

    My power supply is always warm to touch, it becomes a concern when it gets hot to touch.

    Edit: You could replace the power supply if you want, If I recall correctly that power supply is terrible. I think it was for being falsely labelled as 430 watts but only delivering around 350 watts.

    Edit 2: http://www.hardwaresecrets.com/article/Thermaltake-Purepower-430W-NP-Power-Supply-Review/332/9
  26. Alright that should be fine then because it's just warm and I think I have a voltmeter and it said it was fine
  27. Okay but why would that make it just randomly stop not working and overheat processor
  28. jonnysimcoe said:
    Okay but why would that make it just randomly stop not working and overheat processor

    I didn't say it was causing it to overheat but just wanted to give you the heads up that it is a bad power supply. Can you invest in a new heatsink?

    Edit: Not sure but did you try overclocking or anything and tinker around with the CPU voltage? Too much voltage means the CPU will overheat...
  29. I don't think its over heating the CPU, its rather the CPU not getting enough power. You cannot say the PC is shutting down for sure because of over heating.

    Every PC gets hot, its the shut downs we are trying to sort out here.

    I think you need to see it this way. "The PC keeps shutting down" rather than "Overheating"

    Another thing you can do is remove all hardware from the PC and start installing them one after the other after each successful boot. Make sure the PC runs for a certain amount of time just so you can validate its not shutting down automatically.
  30. Another thing, If your PSU has a voltage selector switch 110/240V or 115/230V, you might want to make sure you did not change it by accident.
  31. If you look at the picture. I posted you would see it says it is overheating. So I decided to take everything out of the computer including the motherboard and power supply and reseat everything I thought I made some headway but then the speed fan program told me that it went down to 40 degrees Celsius what is a lot better than before then suddenly it shut off again
  32. Is it me or Temp 2 and the Core temp from the picture are indicating negative temps ?

    Temp 2: -128 ?
    Core: -49 ?

    Can some one confirm please ?
  33. So what was the last hardware you fitted before it shut off again ?

    You need to remember, the whole objective here is to it the hardware back one by one and run it long enough to make sure its not shutting down on that particular hardware any more, then you can add another one and then go through the same process again.

    You have to trust me and change the PSU. In anyway, to find the fault, you will need to change hardware and in this case I strongly suggest you start from the PSU.
  34. Yes they both are reading negative. And no matter what part I take out it still overloads and shuts sown
  35. Just tested my PSU with a multimeter, all readings are where they should be.
  36. I'm guessing you don't have a spare PSU lying around at home. The only way to really get to the bottom of all this is start changing hardware on the PC.

    If its not your PSU, then you should be looking at the CPU itself or Motherboard.

    Not much you can do for now apart from swapping PSU, unless you want to send it out to be repaired elsewhere.

    Please do your best to update me on what happens as i'm curious to know where the issue was.
  37. why are we troubleshooting the PSU?
  38. i've been reading and posting since this thread started, his CPU is running at 100%, so i ask, why are we troubleshooting his power supply?
  39. It is the only thing I believe is causing the PC shut down issues.

    What do you think it might be ? Just trying to get to the bottom of the issue here so read on and pitch in.

    We could use all the help here.
  40. I am not treating it as 100% CPU usage issue here. I believe it is a hardware issue and power related to be precise, unless you think otherwise.

    The PSU is one of the two components that have been replaced previously on the PC.

    If you look at everything he has tried, there is nothing more left to do apart from what I have suggested.
  41. you have a cpu overheat issue, and the its running 100% all the time, and your not treating it as such?

    a psu and graphics card were both replaced, true, but the issue started after a shutdown one night, not after swapping parts.

    still waiting for a reason that the psu is causing this....
  42. I believe he has not tried the new CPU cooler I suggested.
  43. he mentioned he has been using the system before, with no overheating problems, with that same heatsink.

    granted a better cooler would help ( a little) but, why is the cpu at 100% all the time?
  44. I also suggested malware, sometimes it can cause that but he states his scans have shown up with nothing.

    Edit: wait he actually said it does this in the bios as well, so I think it might be something to do with the cooler having been bent or damaged or scratched.
  45. agreed, but he says this happens in the bios as well (if i remember correctly).
  46. daswilhelm Do you have any suggestions at all ?

    You seem to be asking 1 question only. We understand you don't see a reason the PSU is causing this. Well at least come up with something instead of the questions.

    We need answers here not questions
  47. jonnysimcoe, check your CPU for any bent Pins
  48. No pins are bent on the CPU
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