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HELP! PC randomly shutting down

K

kainu7

Weaksauce
Joined
Nov 24, 2007
Messages
81
My computer has just started to randomly shut down on me. First time I had just booted up and went online to read a few forums. I was sitting there reading for maybe 30minutes and then my computer will be off and will not turn right back on. I unplug the power from the outlet and wait a few minutes and plug it back in it will power up.

After the first time I thought maybe it was my OC except the OC was really nothing and I hadnt changed anything in over a month or so. Just to be safe I undid the OC. During OC my max temperature was near 70 C I believe. Now with it undone and running PRIME 95 for 10minutes my max temp hit 63 on one core.

I figured all was fine, played 2 games of league of legends. Quit the game, looked on my iPad for a few minutes and then BAM computer shut off again maybe 8 minutes after playing league this time. So I unplugged it, opened the case, heat sink cool to touch, GPU the same, cool to touch. Touched the power supply...I would say hot. Not so hot that it burned but by far the hottest thing in my case. The PSU has fan side down, there is a air vent in the bottom of my case, the case is on hard wood floors and there is no dust build up on the filter.

My Build

SeaSonic X750 Gold 750W
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Noctua NH-D14
2 x Noctua NF-P14 Case Fans
 
Sounds like a power supply issue, or a bad capacitor on the motherboard. Give your MB a good look for a cap that is swollen and possibly leaking. Also, smell the back of your power supply, and around in the PC case. Sniff for the aroma of burnt cabbage. My first thought would be the PS though. It may not be a fan, but the PS fan could be seized, but just if the fan is working it could still be a cap in the PS. I've replaced many bad caps over the years (and from the pic I saw yesterday on this board about the counterfeit caps, I expect to replace many more in the future). For a MB, I would try to replace a bad cap, for a PS, I would just get a new one. Unless it's like a $150 PS.
 
Just got off work, tried to power it up and nothing. Doesn't even try to power up. The video card and the motherboard both have a green light on them meaning they are receiving some power.

I removed the gpu and tried to power up again, nothing. Hoping for a bad power button I tried to do a manual boot, nothing. I smelled all around my case and I can't smell anything but what the parts normally smell like.

Pulled out the psu, not a lick of dust on it. Nothing at all. I smelled the psu and I don't think it smells burnt or cabbage or anything...I'll be bringing the psu to work tomorrow to use their line tester on it for the mobo line...I hope that it is just a bad psu so I can just rma it.

Anyone have any other suggestions on what to try? Or other possible ideas of what it could be?
 
So I just tested the MOBO power line from the PSU and it was dead. Just requested a RMA from Seasonic.
 
Did you have a load on the PS when you did the test? If I remember correctly (and this is going back a while), ATX power supplies will instantly shut down if they don't detect a load.
 
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