PC won't POST despite all efforts

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brodtaylor

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Aug 6, 2017
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510
I tried everything in the "read this before posting" sticky thread.

Mobo: ga-970a-ds3p
RAM: PNY XLR8 8 GB DDR3 (I have two sticks of 8gb, 16 total)
CPU: AMD FX 8350, using stock heatsink
GPU: GTX 760

I built this PC in 2015 and it has worked great ever since until two days ago. I was playing a game and it froze my entire pc after about 4 hours of continuous play. After restart, I turned the settings to low on the game and played for a few more hours when the PC shut down. After that I haven't been able to get it to POST at all.

I tried with one stick of RAM, with and without the GPU, and even bought a new (identical model) motherboard. I've disconnected everything non-essential. When I push power the fans spin for 1 second then it powers off. I tried the paperclip trick on the PSU and that works fine. I'm at a loss. The only component I'm not sure on would be if the CPU went bad, but from what I've read that's rare?

Any help would be appreciated.
 
Solution
DRagor
After all those tests you made, I see 2 possible causes: either CPU is shorting your system (that would be very rare) or PSU fails to deliver high enough current. You didn't mention what PSU you have, but if it's not one of good models, and also 2 years old, then it's high chance that PSU is the cause. Of course, the best thing to do would be to borrow a known working PSU from friend and test, but if that is not possible, I would consider getting new PSU as worthy move.
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DRagor

DRagor

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Jan 23, 2017
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If it fails to power on, two most probable reasons are failed PSU or failed motherboard. Since you tested 2 mobos, PSU is next to check - and paperclip test is not enough to consider PSU working.
Also note that if you suspect CPU, you can remove it and try to power machine without it - if it still fails to power, you know CPU has nothing to do with it.
 
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brodtaylor

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Aug 6, 2017
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510
Ok I used my multimeter to test the PSU and I'm getting all the correct v readings. I tried the motherboard with no CPU, no GPU, and no RAM and it does indeed power on and stay on... So definitely the CPU?
 
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RaDiKaL_

RaDiKaL_

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Apr 17, 2006
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Without CPU there's simply no execution of the POST (power on self test) so no, that doesn't say anything.

Even if the multimeter gives you good readings it doesn't mean its up to the task, it will give different values when it has to manage the power to the CPU, GPU etc.

Your issue seems to be a shorting somewhere, you mentioned you did all the steps mentioned in the sticky thread, I wonder however if you've tried to breadboard your system?

I'm pretty sure your system doesn't have an iGPU so you need to use the GPU in order to get it to boot, do you get any beep code when trying to boot? with only CPU + 1x RAM without GPU you should be getting a beep code corresponding to a GPU failure.
 
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DRagor

DRagor

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In that case, start adding components one by one, beginning with CPU, and try powering after each added component.
 
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brodtaylor

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Aug 6, 2017
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510
The system is breadboarded right now.

I have yet to get any beeps from the system speaker in any configuration... I'm starting to wonder if the speaker is bad. Anyway, here's what happens in various scenarios.

No CPU, no ram, no GPU: power turns on, stays on

CPU only: power turns on, then immediately off

CPU with 1x RAM: power turns on, then immediately off

CPU, 1x RAM, and GPU: power turns on, then immediately off

Is it worth getting a new PSU to rule that out?
 
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DRagor

DRagor

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Jan 23, 2017
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After all those tests you made, I see 2 possible causes: either CPU is shorting your system (that would be very rare) or PSU fails to deliver high enough current. You didn't mention what PSU you have, but if it's not one of good models, and also 2 years old, then it's high chance that PSU is the cause. Of course, the best thing to do would be to borrow a known working PSU from friend and test, but if that is not possible, I would consider getting new PSU as worthy move.
 
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