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My pc restarts automatically, where should I look first for a solution?Thanks

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Check your BIOS settings first, e.g CPU temperature limits –  warl0ck Apr 29 '12 at 8:07
    
Usually this kind of action is hardware related. ie: video card and such. Check your video card and memory sticks for proper fitment. Re-seat the card and sticks. Make sure you have good ventilation and the heat sinks are clean and fans are working. –  Ringtail Aug 14 '12 at 3:04

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up vote 3 down vote accepted

I had a similar issue and couldn't seem to track it down. It ended up being heat related , it wasn't my CPU overheating but something else on my motherboard causing the random reboot. In this case, the system would poweroff instantly, then restart itself. I stumbled upon the answer by taking off the case side and pointing a box fan at it.

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