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PC shuts off after starting

Discussion in 'Hardware' started by tomiboi, Dec 25, 2010.

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  1. tomiboi

    tomiboi Thread Starter

    Feb 13, 2006
    I'm working on a friend's PC. It's a custom built machine, about 3 years old.

    This is the mobo, XFX nForce 750a SLI

    Basically, the PC shuts off after trying to boot from the hard drive or CD or DVD.

    I swipped the PSU, hard drive (IDE & SATA), DVD/CD drives (SATA & IDE), still during booting the PC turns off.

    The board looks clean, no leaks, the cables are all connected. I removed the video card and connected the LCD to the board's DVI port, nothing.

    Memtest86 shows that the ram is OK.

    Tried loading Win 7 and XP by doing a clean install, 7 stops and XP continues, but the PC shuts off about halfway thru the installation.

    Tried Ubuntu Live CD, once the Ubuntu screen shows up the PC shuts off. At that moment I can feel the mobo under the processor is really hot despite the PC has not been running today at all, only the Ubuntu Live CD is the first thing I ran today.

    When I access the BIOS everything seems fine, last night I left the PC in BIOS for 3 hours and it stayed ON. I reset all the BIOS setting to FAIL SAFE, still PC shuts off.


    Is the mobo going bad or the processor?
  2. PedroHin


    Aug 13, 2010
    are you certain that the heat sink is firmly and evenly in contact with the processor?

    I would buy a bit of heat sink compound, remove the heat sink, re-treat the cpu, and remount the heat sink
  3. johnpatrick1000


    Dec 25, 2010
    I think it could be problem in your comp. processor cooling fan or so much dust there also you are hacked by virus maybe! Try this out! It could be help I think! Thanks :)
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