Is this POST failure?

Hi all. Today, I woke up to find that my computer has been undergoing infinite reboots throughout the night. Being new to building, I'm not sure if this is POST failure--i can actually enter BIOS, but no matter what I do the computer will stop responding in approximately 10 seconds and reset itself. I had overclocked my Core i5-760 to 4 ghz with it running stable for 8 hours in Prime95, temps never exceeding 80 C, and I had been using my computer for almost a week prior without issues. I left it on overnight just idling, so there was not much stress on the CPU when the problem occurred. I am currently not at home, so am unable to start troubleshooting. I'm just wondering if this is a serious problem, or something that will probably be fixed by resetting the CMOS jumpers.

Specs:
Asus P7P55D-E Pro
Core i5-760
Patriot Sector 5 1600 4GB
EVGA GTX 460 768MB
Corsair TX650 PSU

Running Windows 7 Pro x64

Any advice would be greatly appreciated.
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More about post failure
  1. Reset the CMOS memory and see what happens.

    If the problem clears, there was clearly something in the settings that your system didn't like.
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