Computer Randomly Shutsdown and then Restarts or Powers off and Can't be powered on for a while

Just this morning I was playing video games on my PC when suddenly it turned itself off and then turned itself back on again. I thought I'd just accidentally kicked the plug or something but then it did it again 20 minutes later and wouldn't power back up for about 5 minutes and after I plugged it into a different socket.

Then I was watching something with VLC and suddenly it did it again.

I thought it might be heat but nothing is running over 40 degrees centigrade, even on this sunny summer day in a closed room. I did a memory check recently and it turned up clean, both sticks, 2 passes.

I think it's either my Hard Drive which speedfan and HDsentinel both tell me isn't doing so hot or my PSU which is about 5 years old. I'm leaning towards PSU because it's both old and I've been having problems with my graphics driver crashing and restarting mid game which can apparently be caused by the PSU voltage on the +12v rail dropping too low for a second.

Any help would be appreciated!


Windows 7 Ultimate
8GB G.Skill DDR3 RAM
Gigabyte 990XA-UD3 MoBo
2GB AMD Radeon R9 270X
2TB Seagate HDD
700GB Samsung HDD, URL is what HDSentinel has to say about my HDD.
Corsair GS600 PSU

EDIT: Forgot to mention my HDD has been like that for ages, so it'd be surprising if it was only just now causing these problems.
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  1. Best answer

    My first guess would be the PSU aswell.
    What you can do is easily test the HDD to see if there is some problem with that, good tool is HDTune -

    There is special PSU testers where you can easily see the voltage, but instead of buying one you might just want to buy a new PSU, unpack it carefully and then return it and say you didnt need it or something if that wasnt the fault :)
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