Computer Shuts down randomly, Can't find the cause.

Been having a strange crashing issues that started about two months ago where the computer all the sudden well turn off. It doesn't seam to matter what i am doing when it occurs such as browsing the web, watching videos, or gaming. About a quarter of the time when it reboots and attempts to automatically reboot, the hard drives will start spinning and the CPU fan will start. The case fans or fans on the video card do not start. I've never received a blue screen or a system hang just "kernel power failures" according to windows event viewer.

*Edit: I'm running windows 8, and I've re-installed a few times trying to solve this issue.

System Hardware:
i7 2600K 3.4Ghz @ 4.2Ghz (issues exist if not overclocked)
Asrock p67 pro3 mobo
24GB ddr3 RAM (Did a memtest and passed)
GIGABYTE GV-R695OC-1GD Radeon HD 6950
Corsair HX650 PSU (650 Watts)
Main drive is an Intel 520 SSD

I've already ruled out overheating as a cause.

Thanks for any help, i'm out of ideas. If you need any logs let me know and i'll provide them.
4 answers Last reply
More about computer shuts randomly find
  1. What is the make/model of your PSU? Generally, those symptoms are associated with a cheap, too small, or failing PSU.
  2. clutchc said:
    What is the make/model of your PSU? Generally, those symptoms are associated with a cheap, too small, or failing PSU.


    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139012
    ^ There it is, I have a volt meter and the PSU is still well under warranty. I don't think it is due to being under powered the system has been stable for months before this issue started appearing. How reliable is testing with a volt meter before i tear the thing apart to test that theory.
  3. pcjamesy said:
    clutchc said:
    What is the make/model of your PSU? Generally, those symptoms are associated with a cheap, too small, or failing PSU.


    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139012
    ^ There it is, I have a volt meter and the PSU is still well under warranty. I don't think it is due to being under powered the system has been stable for months before this issue started appearing. How reliable is testing with a volt meter before i tear the thing apart to test that theory.


    Not as likely now that I see that it is a high quality Corsair and of sufficient size. Of course, it could still be defective. But not as likely as maybe looking elsewhere first. The other symptoms like some things starting while others do not, would lead me next to consider the motherboard itself. No easy way to test that, however.

    Btw, a voltmeter test would no doubt show all is good, anyway. It would only take a brief instant of a break in the voltage to cause the shutdown.
  4. It may not be a hardware issue. Scan for malware and viruses using your anti virus software and download malwarebytes. If you overclock your CPU, or GPU, this may be the cause.
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