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Question Computer won't turn on if I have the cpu power plugged in

Jun 22, 2020
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Hello, so on Saturday I was using my computer just playing some valorant when it suddenly turned off. I just thought maybe I had nudged the power cable or something so I tried turning it back on and nothing happened and basically thought I'd narrowed it down to a power supply problem, so I ordered a new power supply that came today. Connected everything and nothing happened. I figured out that it would start up if I unplugged the cpu power plug. I have tried different graphics card different cpu but nothing. I looked at the capacitors on my MB and they all look fine.

Any help would be greatly appreciated.

Thanks
 
Jun 22, 2020
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Yeah, it turns on without the cpu power plug in.

Ryzen 7 2700x
GTX 1050ti
8gb corsair 3000mhz
The psu is just a generic 500w one from amazon (im pretty sure theyre all the same)
 

onespeedbiker

Estimable
Apr 13, 2019
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197
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What the OP likely means is when the CPU fan is plugged into the CPU fan port it will not boot; usually the opposite is the problem. If this is the case, I would check the pins in the port and the fan plug. If they look good, you might want to look for a new heatsink/fan and see if it fixes the problem.
 
Jun 22, 2020
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What the OP likely means is when the CPU fan is plugged into the CPU fan port it will not boot; usually the opposite is the problem. If this is the case, I would check the pins in the port and the fan plug. If they look good, you might want to look for a new heatsink/fan and see if it fixes the problem.
I'm not talking about the cpu fan port, I mean the 4+4pin
 

Karadjgne

Titan
Ambassador
Well normally a motherboard/cpu will require both the EPS and the Mains plugged in for function, but there's a few reasons why it fails if the EPS IS plugged in. Can be bent cpu pins, defective mobo, miswired psu, miswired EPS, motherboard short to case etc.
 
Jun 22, 2020
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I have 'breadboarded' it and tried a different graphics card, cpu and psu and the same thing happens each time. Which leads me to believe that it may be the motherboard? I have had a good look at it and cant see any bad capacitors the motherboard is the a320 sh2 (i dont think i mentioned it before)
 

coastie65

Splendid
Okay, you said that it starts up when nothing is plugged into the CPU headers. Okay. As stated, those are 4+4 ( total of 8 pins. The is a Connector from the PSU that is 4+4 and CPU specific. There is an 8 pin Connector as well and you should NOT be using that. What they provide as far as current goes is different.
 

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