Shutting off randomly

My computer has been running perfectly stable since my last windows install (less than a year). I was playing through the first three episodes of a game, everything was fine. Then I started the forth episode and started encountering my computer just shutting off like someone flipped the power switch (not a full shut down or restart). At first I thought it was only isolated to the game but then it happened at various points of other computing (music production, idle, and general web surfing). It doesn't happen a lot but it is completely random.

Things I have already checked.
overheating (idle is 42 degrees with 62max under heavy load on both cpu and gpu)

I ran a memory check with no issues

There is no malware/virus/trojan present, completely clean

I checked all sockets and plugs, everything is solidly in place

I ran a Windows repair with no issues

I updated display drivers

So I am trying to narrow it down. PSU dying? Something crapping out on the mobo/cpu? Corrupted Windows install? I am really at a loss. The only consistent time this happens is in games but still can happen in idle or even just logging into Windows.

My system is nothing crazy, AMD Phenom II x4 965, lower end ASUS mobo, 8gb ram, Asus GTX760, 650watt PSU, Windows 7 Home Premium 64bit.

Any insight or help is appreciated, thanks in advance.

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Shutting off

Get a can of compressed air and a small brush.
Remove the side cover and give the innards a good cleaning.
The brush is for the heat sinks and fans just in case there's some stuck on stuff.
Don't forget to give the psu a few shots of air....both directions.

Power it up and make sure all the fans are spinning.
Leave the side cover off and test.

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Is that game gpu intensive or cpu?

Is that game gpu intensive or cpu? Either of them might be causing the problem.

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