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    Very good response - I'd only add the action to check that the CPU isn't overheating and causing it to bail. This might (if the BIOS setting to auto restart is set) be contributing to the reboot cycle. Ensure the CPU fan is spinning, the heat sink is clean and if you're able, ensure the thermal paste between the CPU and heat sink is good. Commented Feb 23, 2013 at 17:31
  • Good addition there. I never thought to include that as I've never had a problem with a CPU overheating. @snakile should this be the case, I recommend you buy a tube (only the small 3 grams one needed) of Arctic Silver and use that between your CPU and its' heatsink. YouTube has lots of good guides on how to apply it, but the key point is thinner is better. I also find using a sandwich bag or latex glove is the easiest way to apply it.
    – Adambean
    Commented Feb 23, 2013 at 18:17
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    @snakile I see you accepted my answer there. What was the issue, out of interest?
    – Adambean
    Commented Feb 24, 2013 at 15:04
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    I had this exact same problem and it turned out to be a bad stick of memory. Thanks for your in-depth answer! Commented Feb 10, 2015 at 21:40
  • I have an old PC that started doing that in the past year. but sometimes it can be solved with a hit on the side. also seems always bios needs to recover (likely cmos battery). I wonder if something touching case or just the hit "fixing" a component Commented Jun 9, 2017 at 4:33