Computer resetting itself whenever I play video games

Okay I have taken this computer into a computer store and they ran it under load for 4+ hours without it restarting once. I cannot play any video games on it because as soon as I start a game up (Diablo 3 or Dota 2 usually) it just restarts itself.

System Specs are as follows:
CPU: Intel Core i7 920 2.67GHZ
RAM: 12GB Kingston 1600mhz (Just replaced yesterday)
GPU: AMD Radeon HD 6870
PSU: OCZ Fatality 750W (This was bought about 2 Months ago)
MOBO: Asus P6T

I have tried everything on this including reinstalling windows and making sure temperatures weren't high. None of this has been OC'D its all stock standard.

The computer isn't creating a a minidump file when it restarts either otherwise it would be attached.

It's driving me insane. Any other information you need I can provide.

P.S Forgot to say its running Windows 7 64 Bit Service Pack 1
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  1. so it only happen when you run it at home?
  2. Can you run graphics benchmarks without any issues?

    Has it only happened since replacing the ram?
  3. It has only been happening since about a week ago. The computer was running fine till about a week ago when it just started doing it. I can run graphics benchmarks and CPU benchmarks fine but as soon as a video game goes on it restarts. No it hasn't just started since I put the ram in. I'm almost convinced that the power supply isn't outputting enough on the 12 volt rail. I've switched up the modular connections to see if I was tripping any switches by overloading the rail and nothing changed its still restarting. Could it be possible that ive been given a dud psu?
    The computer store ran benchmarking tests fine and had no problems with it either so I'm pretty sure it's just a psu issue. I mean if I had another graphics card then I'd be able to test the gpu a bit more reliably but I don't have one :(
  4. sound very much like the problem with my little-brother's laptop! I think there's a hard-disk failure... Try and use this software called "Macrorit Disk Scanner" - http://macrorit.com/disk-surface-test/disk-surface-test.html try and leave a link for the results!
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