My Computer can only be turned on or off through the PSU's switch.

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BleachBoy164

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Oct 27, 2016
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Okay so about a week ago I awoke to a burning smell in my office. I went to go look at my computer only to see it black screened It was still running mind you so I went to shut it off but the power button didn't work so I turned it off through the PSU. I took it apart the next day to find that what looked like a small what I presumed to be electrical fire had swept through the PSU (Causing the burning smell) at which point I proceeded to freak out a bit and counted my blessing. After which I proceeded to order and install a new PSU. Now here comes the real problem everything works fine now the system post and I can use my computer BUT I can't shut the system down or boot up any other way besides using the PSU. Every time I turn the PSU on the computer jumps to life and use of the power button doesn't do anything. I've checked the case's switch wiring to the motherboard I've looked in the bio's for any automatic reboot settings and found nothing I've got a feeling it's motherboard related in that either there is a weird hidden power option in the bio's or something was fried by the previous PSU. Any help would be more than appreciated.

Relevant SPECS:
Motherboard: Sabertooth 990fx (Original)
(New) PSU: Corsair AX 760
CPU: AMD FX-8350
GPU: MSI GTX 970
RAM: G.Skill SNIPER Series ‑ DIMM 240‑pin 4gb x 4
 
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lindsay24

lindsay24

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Mar 30, 2015
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I will second the motherboard theory as well.

Pressing the power button on your PC essentially shorts out the green and black wire of the 24-pin cable, which powers on the system. So it's seeming like these wires are just permanently shorted together.

Long story short, I wouldn't really worry about it unless it's causing problems. Just be sure to shut down your system through Windows, and not the PSU switch for obvious reasons... Haha!
 
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lindsay24

lindsay24

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Mar 30, 2015
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Ah, I thought you were only using the power button. My bad.

In that case, what I said still holds except now it's causing problems. It is likely the motherboard, but it would be a shame to replace it and continue having these problems.

Maybe try submitting an RMA for the power supply first, and see if this keeps happening with the new one. If the problem continues, replacing the motherboard should definitely fix it.
 
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BleachBoy164

Commendable
Oct 27, 2016
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1,510
You think it could be something superficial like a dead battery on the motherboard? I don't think it could be the bio's since A) it's up to date and B) last time I touched the bio's was well before this ordeal.
 
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lindsay24

lindsay24

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Mar 30, 2015
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I tend to doubt it. The battery is mainly just to remember BIOS settings, date, time etc... But it might be worth the $3 to give it a try.

I'd be surprised if the BIOS is the problem here. It sounds like a hardware issue to me at least.
 
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