Random PC Shutdown

Andrea Banca · Mar 3, 2014

I built a new PC about a week ago and there is this problem i can't manage to solve.
My PC specs are this:
-Asus Z87 Pro
-i7 4770k
-Asus GTX 780 DirectCUII OC
-Corsair AX860
-Corsair Vengeance Pro (2x8GB) 1866Mhz
-2x WD Black 1TB
After the first day of use my pc started to ramdomly shutdown. I changed my MB but with no succes. I tried to boot my pc with only the cpu (with and without ram) with the same result.
What could it be?

thor220 · Mar 3, 2014

Is this the first time you installed an intel processor. #1 culprit is incorrect cpu install/bent pins.

Andrea Banca · Mar 3, 2014

thor220 :

No, actually is the third time. I bulit a PC with the same specs (excluding the VGA) the day before for a friend and he never had a problem.

thor220 · Mar 3, 2014

I've had the same issue before and the solution was to get a motherboard replacement. I would say look for bent pins but they are so small that it's very hard to tell without a magnifying glass and a light. I found out it was a pin issue by clapping the top of my case with my palm. Every time I applied force the computer would shut down and turn back on.

Andrea Banca · Mar 3, 2014

thor220 :

Well, i already changed the motherboard. Infact for a couple of days it run smoothly, but every now and then it shuts down. 2 ago it shutted down after 30 minutes and went i switched it on i didn't have a single shutdown since when i shutted it down myself. Today, after six hours the same as the other day. I was forced to completly power off the PSU and power it on after a couple of second to be able to power on the pc again.

thor220 · Mar 3, 2014

Ok so it's not the motherboard or cpu. You're going to have to run some tests to find the problem.

1st. Check cpu temps to make sure they are not too high (78c and above)
2nd. Run a memory test
3rd. Use western digital data lifeguard to make sure the hard drives are not at fault.
4rth. swap power cable and then psu(test separately).

these are preliminary tests to isolate possible hardware issues.

Tradesman1 · Mar 3, 2014

Might be a short to the case or loose power plug somewhere, might want to bench it, have a guide that might help here:

http://www.tomshardware.com/faq/id-1753671/bench-troubleshooting.html

Andrea Banca · Mar 4, 2014

thor220 :

1- CPU temps are around 30°c (I use a corsair h100i).
2- I alredy used memtest86 (4 passes) and after 6 hours the test was ok, no errors.
3- I tried to power on the pc without the HDs, the pc shutted down even in the bios settings.
4- Unfornuately i don't have another PSU to test...

thor220 · Mar 4, 2014

Andrea Banca :

As Tradesman1 said, try pulling your motherboard out unto a non conductive surface and running the system from there. If you still have issues, the last test would be to swap cpus. It's the last part to be isolated (other than the psu).

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