Possibly a faulty PSU

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FuzzyDice

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Nov 12, 2016
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I think I might have a faulty power supply because when I shut down my PC I often cannot open it up again. It just stays dead, even though I'm pressing the power button. It seems like there's no power in it, but when I connected my phone to it, the phone started charging. The only major problem is that I can't start it up again for sometime, for indefinite periods of time. But when I do manage to start it up it works without a hitch. Help would be most appreciated.
Here are my PC specs if you need them:
CPU: Intel Core i3 4160
Mobo: Gigabyte B85-HD3
GPU: AMD R7 370
PSU: Seasonic G450 (450W)
 
Solution
Rogue Leader
The PSU is likely not faulty if it turns on. Thats also a really good quality PSU.

What you should do is get some wire and make yourself a PSU tester, basically find the green and black wires (pins 15 and 16), and jump it out see if it turns on. Try that multiple times to show its repeatedly turning on. If thats the case I would suspect a motherboard issue, or maybe the power switch, the board is likely not triggering the PSU to turn on.
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Rogue Leader

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The PSU is likely not faulty if it turns on. Thats also a really good quality PSU.

What you should do is get some wire and make yourself a PSU tester, basically find the green and black wires (pins 15 and 16), and jump it out see if it turns on. Try that multiple times to show its repeatedly turning on. If thats the case I would suspect a motherboard issue, or maybe the power switch, the board is likely not triggering the PSU to turn on.
 
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FuzzyDice

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Thanks, I will be trying that soon. I haven't tried shorting the power pins yet to see if it would start, but I checked the wires that go into the power button on the case and everything looked fine. But I'll try what you said and come back with another response.
 
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FuzzyDice

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So I tried to short jump start the power supply by using a paper clip introduced into the green wire and a black wire. I switched the power button at the back of it and nothing happened. Shouldn't the PSU's fan spin? I haven't plugged in to it any other fan.
 
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Rogue Leader

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Correct, if the fan doesn't turn on then you have a defective PSU. Make sure you're using specifically the green and black wires that are next to eachother. I bet if you try it a few more times it may turn on. Still defective.
 
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FuzzyDice

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Yeah, I even tried checking it with the multimeter but I get 0.00V on all pins. Guess I'll RMA it. Good thing it has a 5 year warranty. But it's strange that it never crashed while I was using the PC, only after I was shutting it down.
 
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FuzzyDice

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I have one question though. Are we sure it's the PSU? Bceause I managed to boot the PC up 4 times in a row now and I'm really amazed that it happened.
 
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Rogue Leader

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It sounds like an intermittent PSU issue, based on your saying that the PSU failed the paperclip test, could be a bad cap or something in there I really don't know without physically seeing it, internally. Its the type of issue that can happen.

It may turn on fine now, and if you want you can wait it out and see if it stays that way. But IMO theres some failure going on. Now the Seasonic G series has I think a 5 year warranty, so it may be worth a call to Seasonic to get a warranty replacement.
 
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