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Arbitrary Shutdowns of a newly built PC

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  • Components
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August 28, 2013 7:38:16 AM

I built a PC for a friend. It ran smoothly for a (relatively short) while, but then he started reporting crashes. The crashes are not like anything I have seen so far. They do not occur regularly, but at seemingly arbitrary time intervals. When it happens, the 'click' sound you hear when the PC boots up sounds, and the PC shuts down immediately, usually tries to reboot itself, but fails.
It is then dead, as in the MB shows that it has power, but can't be started (neiher from the case power button, nor from the button on the MB itself).
Powering down PSU, unplugging, plugging in again and trying to power up doesn't work.
I reverted to removing all components one by one, and when I removed the GPU, the MB booted by itself. I have not yet been able to reproduce this, however. It seems that the self-bootup happens as arbitrarily as the self-powering down.
The specs of the PC are as follows.

MB: MSI z77 mpower
CPU: Intel Core i7 3770 3.4 GHz
RAM: 2x 8GB DDR3-1600 Corsair
GPU: Club 3D Radeon HD 7950
PSU: BeQuiet DARK POWER PRO P10 650W
HDD: 1TB SATA-3 WD Caviar Green
SSD: 840 Pro Basic 256GB
Case: Fractal Design Define r4
Win8 64-Bit

Additional note: During the time the PC ran smoothly, I wanted to show my friend CPU-Z, but it didn't work, failing to initialize. I found that quite weird.

Thanks for any tips.

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August 28, 2013 7:48:31 AM

Have you run memtest? Checked for bent pins on the CPU? Power problems normally point the the PSU, but it could be a loose connection, or something warming up, then shorting out.
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