PC turns off and then back on within a second

jackt666

Honorable
Sep 14, 2012
2
0
10,510
Specs :
Intel i7 2600k
Sapphire AMD 7950 3GB GDDR5 Vapor-x
Gigabyte P67A-D3-B3 Rev 1.0 (latest bios)
4 x Kingston Hyper Blu DDR3 4GB ram
Seagate 3TB Barracuda Internal Hard Drive
XFX PRO 750W
Windows 7 SP1 64-bit

SO my pc will automatically shut down and reboot once a day after about 4 hours use and won't do it again for a couple days. It is more or less completely random i could be doing some intensive gaming or nothing at all with the pc idling.

The only reason i know it was a random shut down is because when i reboot the unexpected shut-down warning appears before the os loads.

I've run benchmarks such as prime 95 and pc mark to try and replicate the event i've even maxed crisis 3 and nothing happens, it just carries on as normal.

All temps are good and never exceed 50 degrees centigrade on any of the internal sensors (processor or otherwise) voltages are well within acceptable ranges and the only error in the system log is that an unexpected shut-down occurred.

What on earth is going on?
 
programs for testing hardware:
CPU: Prime95 run for 6-24 hours and Intel Burn Test run on maximum ram and for 20-30 tests. run them separately but run both.
Ram: Memtest86+ burn to disk or flash drive and run at system boot.
GPU: OCCT on GPU test with error check ON, run for 30 - 60 mins.

If this does not produce a problem I would start turning processes off one by one to try to find the conflicting program.