Hardware Problem (crashing after gaming)

Conleak

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Okay, so I've had a consistent problem of playing a game and when exiting the game, my computer crashing. Sometimes I'll crash during a game and sometimes I won't crash at all. But usually after playing a couple of high-res games, my PC will crash.

I have covered all software bases and I'm pretty certain it's a hardware problem.

So, details about the crash:

Usually it's just a white screen, my PC will remain on but it will be un-reactive (apart from the optical drive which I can eject) and so will the peripheral devices, e.g. keyboard.

Extra Info:

It usually happens on high-res games, like FPS or Strategy games like Civ 5.

Also, on the 3DMark demo I crashed on the 'Fire Strike' test, 'Graphics Test 1'.
 

Conleak

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Everything was brand new.

CPU: Intel Core I5-3570 Processor
Mobo: ASRock H77M
RAM: Kingston 8GB (2 x 4GB)
PSU: Corsair CX750M
GPU: Nvidia GTX 770 2GB
Storage: Seagate Barracuda 2TB

Everything from Amazon apart from GPU, which was from Scan.
 

Conleak

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Already done that step. Removed all drivers on my PC and reinstalled. Recently checked all and they are up to date.
 

Conleak

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I've updated many times since it happens, stable versions and beta versions and it happened on every one.
I have underclocked the card to as low as it can go and it still crashes.
 

Conleak

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Monitored the temps, highest i've seen is around 60 celcius. CPU also runs at a low temperature and I've ran Memtest. Found no problems with the RAM.
 

Conleak

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It won't be the power supply. I've changed the power supply and it hasn't made a difference.
 

Conleak

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Yes, it's not the RAM. I've spoken to the sellers about the GPU and I have issued a return and swap. Is there anything I can do to test the Motherboard?