Computer randomly shuts down then restarts critical error Kernal Power 41

First time build (September 2012). Machine has been performing flawlessly then end of September 2013 starting randomly shutting down and restarting. No particular activity will trigger this event (no BSOD). I've run memtest, chkdsk, malwarebytes, gpu-z, cpu-z, Nothing seems out of the ordinary. Temperature ranges are consistently around 26C. I've left it on for the last 48 hours with the covers off and a fan blowing directly at the inside of the case and it has shutdown 8 times. This happens even when it is idling. Truly bizarre, definitely frustrating. Need some help here isolating this "gremlin" and regaining control of my machine. I;ve attached a minitoolbox report maybe that willl help you get a better picture.

Asus P8H77-V

Intel i5 3570K

16.0GB Ram

Windows 7 64bit service pack 1

nVidia geforce GTX560

ForceWare 311.06 (driver)

Cooler Master 212 EVO

OCZ ModXstream-Pro (don't remember the wattage, but purchased larger than the recommended

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