Forgot 8 pin CPU connector now PC won't POST

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nagromicous2000

Aug 19, 2018
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I was just changing the fans on my AIO radiator and I had to unplug the 8 pin CPU connector. When I turned the PC back on the fans would spin up for a second then stop, and this would repeat continually. I noticed the problem and plugged the power cable back in.

However, the problem persisted. I've tried unplugging EVERYTHING and plugging it back in. I've cleared CMOS several times. I've reseated the GPU and RAM and removed a DIMM and tried all 4 slots. Now, the PC stays on for about 20 seconds with error lights switching between RAM and CPU on the motherboard. The PC still turns off and this repeats. I've confirmed the power supply is not at fault.

It's an 8700K and Aorus ultra gaming Z370.

I'm in mega panic mode. Please help.
 
Solution
Darkbreeze
Did you plug the cable in while the system was RUNNING?

If so, you probably, almost certainly, damaged something. Either the CPU or motherboard. You don't EVER, EVER EVER EVER EVER unplug or plug in things while the power is on. Anything. The only things that should EVER be unplugged or plugged in while the system is running are hot swappable hard drives, preferably only if you have a hot swap bay, or USB connections. Everything else, you power off FIRST, and then fix the problem.

Try this, although I'm skeptical it will help it is still worth a try.

With the power OFF, unplug the power supply from the wall. Remove the CMOS battery for about five minutes and during that time press the power button on the PC for about 30 seconds...
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Darkbreeze

Darkbreeze

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Jun 24, 2014
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Did you plug the cable in while the system was RUNNING?

If so, you probably, almost certainly, damaged something. Either the CPU or motherboard. You don't EVER, EVER EVER EVER EVER unplug or plug in things while the power is on. Anything. The only things that should EVER be unplugged or plugged in while the system is running are hot swappable hard drives, preferably only if you have a hot swap bay, or USB connections. Everything else, you power off FIRST, and then fix the problem.

Try this, although I'm skeptical it will help it is still worth a try.

With the power OFF, unplug the power supply from the wall. Remove the CMOS battery for about five minutes and during that time press the power button on the PC for about 30 seconds.

Reinstall the CMOS battery, plug the unit back in, power on and then LET IT CYCLE through it's on and off process which is possibly a memory training process, for at least five times before determining that it simply is not going to boot. If it still does not boot or POST, or even allow you to enter the BIOS, then something was damaged.

If you didn't plug that in while it was running, then I'd suggest perhaps you may have plugged the wrong 8 pin connector in. Make sure it is the EPS 12v 8 pin connector which SHOULD actually be two four pin connectors, depending on your power supply model.
 
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Solution
Darkbreeze

Darkbreeze

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Jun 24, 2014
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What is your cooler model and what kind of fans did you switch to?

Where are the radiator fans connected now?

Where is the pump connected now?

Do you know whether or not your setting in the bios to protect the system if it does not detect an RPM signal from the CPU fan was disabled or enabled?
 
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nagromicous2000

Aug 19, 2018
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Cooler model is a H110. I didn't unplug the pump and it's still plugged in. The radiator fans spin when I turn it on so I doubt it's overheating because it's not even overclocked.

The fans I put in are just the stock fans plugged into a splitter and then the motherboard 4 pin cpu fan header.
 
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Darkbreeze

Darkbreeze

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So, which is it? Did you change fans, or are they the stock fans, because your statements seem to be contradicting themselves, or else I'm missing something. Thanks.

 
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nagromicous2000

Aug 19, 2018
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There's no contradiction. I was swapping back to the original fans. Thanks for your help but it turned out to the motherboard was dead. I replaced it and I'm all up and running again! Cheers.
 
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