Computer Instant Shut-down Problem.

Hey guys,

This has gotten even worse. My computer shuts down randomly (more so when playing games both dx9 or dx11), as if the power plug was pulled. After the shut-down the power switch does not work until I reset the PSU. This seems very much like a PSU problem, but voltage readings seem fine. How should I troubleshoot further?

Things I've tried:
monitor +12, +3.3, etc with Prime95 for ~30 min.
Furmark for ~30 min.
Monitoring temps (CPU, GPU all excellent)
Replacing Ram.
Re-installing / updating drivers.
Yelling at computer.
An RMA of the PSU available. However, I'm scared that the PSU may not be the problem.

My computer:
SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM SATA
G.SKILL Ripjaws X Series 8GB (2 x 4GB)
Intel Core i5-2500K Sandy Bridge 3.3GHz
Antec High Current Gamer Series HCG-750 750
EVGA SuperClocked 012-P3-1572-AR GeForce GTX
MSI P67A-G45
Windows 7 64 bit
Not Overclocked at all.
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  1. One more thing: The MSI motherboard is weird. Its info sheets are next to useless, and the software texts seem like a non-english speaker wrote them. The MB is really hard to understand in terms of functions, yet it has lots of weird functions.

    Anyone have experience with MSI board configs (Eup 2013? Greenpower? phase control, etc?) and how to configure them optimally?
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