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Need advice please - Bad Mobo or PSU?

Last response: in Motherboards
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May 30, 2013 1:09:54 PM

Ok so basically my PC will lose power randomly, doesn't matter what im doing, gaming, web etc. It will lose power, then it wont even turn on, sometime for minutes, sometimes for hours.

It is completely random, it happened first a couple of weeks back, wouldnt turn on for nearly a whole Sunday, since then its been fine, but today its playing up again.

When it wont turn on, i done some testing, I unplugged everything from the power supply, used the test button on my PSU, works fine, as soon as I connect the main motherboard lead however it trips it and loses power.

Its not my temps (they are fine) Windows is fine, my case is spotless inside, wiring is tidy, connectors seem ok, something is not right between my mobo and PSU. I even tried removing the mobo battery, that has mixed results in gaining power again however.

Here are my specs:

i7 3770k stock cooler, stock clock
Reference GTX680
Gigabyte Z77-D3H - F17 bios
16.0GB Dual-Channel DDR3 @ 666MHz (9-9-9-24)
112GB KINGSTON SV300S37A120G (SSD)
1863GB Seagate ST2000DM001-1CH164 (SATA)
PSU - Corsair AX860i

Please someone, this doesnt make sense, thanks in advance.

More about : advice bad mobo psu

a b V Motherboard
May 30, 2013 1:22:00 PM

First thing I would try is testing with another PSU. If it isn't a heat problem (and from the symptoms, I would doubt it), it has to be something flaky in the PSU - probably a capacitor.
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May 30, 2013 1:27:12 PM

ronintexas said:
First thing I would try is testing with another PSU. If it isn't a heat problem (and from the symptoms, I would doubt it), it has to be something flaky in the PSU - probably a capacitor.


I wish I could but I dont have a spare one :(  Completely on its own the PSU will work fine, as soon as the mobo is connected though it trips out.
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a b V Motherboard
May 30, 2013 1:41:44 PM

Super_Hans said:
ronintexas said:
First thing I would try is testing with another PSU. If it isn't a heat problem (and from the symptoms, I would doubt it), it has to be something flaky in the PSU - probably a capacitor.


I wish I could but I dont have a spare one :(  Completely on its own the PSU will work fine, as soon as the mobo is connected though it trips out.


Unfortunately, without access to a laboratory folks like us must replace suspect components with known good ones to troubleshoot our problems. Find a good PSU.
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a b V Motherboard
May 30, 2013 1:43:21 PM

If there are voltages that are off - often the mobo will shut down the system to prevent damage to it. All power is controlled through the mobo. I would say that 75% of the time, it is the PSU, 25% of the time it will be the mobo that is the issue.
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