PC Won’t start up with CPU Power Plugged in

iamavenue · Feb 18, 2021

My PC randomly shut off a night ago so I gave it a night. I went to turn it on after but it only lights up for half a second and doesn’t start. I unplugged the CPU power cord and then it starts, but you can’t do much without that.

Specs:
Mobo: MSI MPG Z390 Gaming Edge AC
CPU: i5-9600kf
GPU : MSI GTX 1660
PSU : EVGA 650w Power Supply
16gb of DDR4 Corsair Vegenace Ram

any help?

Peter1986C · Feb 19, 2021

iamavenue said:
unplugged the CPU power cord

How would it even boot then? Or I misunderstand something here :confused:

I suggest that all parts have the required power cables attached, turn off the switch from the PSU and then turn the PSU switch on again. Then proceed to power up the computer. Please let us know the results.

iamavenue · Feb 19, 2021

Peter1986C said:
How would it even boot then? Or I misunderstand something here

I suggest that all parts have the required power cables attached, turn off the switch from the PSU and then turn the PSU switch on again. Then proceed to power up the computer. Please let us know the results.

It doesn’t boot up to windows, but things like the fans+lights will start up. I already tried the PSU switch, no luck though.

Caring1 · Feb 19, 2021

iamavenue said:
It doesn’t boot up to windows, but things like the fans+lights will start up. I already tried the PSU switch, no luck though.

When you turn off the PSU, leave it for say 30 minutes to drain all power and allow it to reset itself, or hold in the front panel power button while it is switched off.
Try another PSU if you can, beg, borrow or ~~steal~~ buy.
Try removing all Ram and booting.
Remove the CPU to check the socket and pins.

micropage7 · Feb 19, 2021

i agree you need to check from the power cable then the PSU first

thesmokingman · Feb 19, 2021

What's the cpu power cord to the OP?

RJARRRPCGP · Feb 19, 2021

I suspect faulty MOSFET(s)!

twicksisted · Feb 19, 2021

Faulty motherboard, Faulty CPU or Faulty PSU

Test each to isolate the issue.

iamavenue · Feb 19, 2021

twicksisted said:
Faulty motherboard, Faulty CPU or Faulty PSU

Test each to isolate the issue.

is there a way i can test these without completely different parts? I can’t get different parts right now to see which one it is

twicksisted · Feb 19, 2021

iamavenue said:
is there a way i can test these without completely different parts? I can’t get different parts right now to see which one it is

Not sure to be honest, I would swap each part out to check if they were at fault to narrow it down, starting with the easiest part and working my way round to the motherboard which would take the most effort to swap out

biffzinker · Feb 19, 2021

The main board or power supply would be the two worth your time troubleshooting. CPU’s rarely up and die.

Zach_01 · Feb 19, 2021

iamavenue said:
My PC randomly shut off a night ago so I gave it a night. I went to turn it on after but it only lights up for half a second and doesn’t start. I unplugged the CPU power cord and then it starts, but you can’t do much without that.

Specs:
Mobo: MSI MPG Z390 Gaming Edge AC
CPU: i5-9600kf
GPU : MSI GTX 1660
PSU : EVGA 650w Power Supply
16gb of DDR4 Corsair Vegenace Ram

any help?

What kind of EVGA 650W is this, and how old is it?
For me is either PSU or the board... Some kind of short circuit maybe.

Can you measure the volts from every cable on that EPS CPU cord when pc is running?
1. Unplugged
2. Plugged

Between yellow and black it should read +12V. If you can do this, test all of them. If all of them have the same color then see below the EPS-12V

iamavenue · Feb 24, 2021

twicksisted said:
Faulty motherboard, Faulty CPU or Faulty PSU

Test each to isolate the issue.

I tried a new PSU, still no boot with cpu power plugged in.

Bones · Feb 24, 2021

The "Blink" taking place when you try to start it indicates it's going into protect mode, hence the blink so you definitely have a problem. I'd have to say most likely it's board related but could be something else.

twicksisted said:
Not sure to be honest, I would swap each part out to check if they were at fault to narrow it down, starting with the easiest part and working my way round to the motherboard which would take the most effort to swap out

This is the way to do it.

Caring1 · Feb 24, 2021

Check the cooler isn't loose as it could be thermal protection shutting it down with the CPU power connected, also if that is fine it could be thermal paste on the pins, this would require you remove the cooler and CPU and check the socket.

iamavenue · Feb 25, 2021

Bones said:
The "Blink" taking place when you try to start it indicates it's going into protect mode, hence the blink so you definitely have a problem. I'd have to say most likely it's board related but could be something else.

This is the way to do it.

I swapped out the PSU, and there was still no luck and just the blink. Do you think it’s the board or the cpu at this point.
I inserted a picture of the cpu socket with nothing on it anymore... Anything look out of the normal?

biffzinker · Feb 25, 2021

iamavenue said:
I inserted a picture of the cpu socket with nothing on it anymore... Anything look out of the normal?

Socket looks fine

iamavenue · Mar 7, 2021

I purchased a new PSU, no luck. I purchased a new motherboard today, still no luck. CPU at this point or what?

biffzinker · Mar 7, 2021

One of the RAM sticks may of died.

iamavenue · Mar 7, 2021

biffzinker said:
One of the RAM sticks may of died.

Tried booting with one ram stick each, no luck.

FireFox · Mar 7, 2021

iamavenue said:
CPU at this point or what?

New Motherboard/PSU, Ram sticks works then i assume that CPU is the culprit, maybe try it outside the case, GPU is working?

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PC Won’t start up with CPU Power Plugged in

iamavenue

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Peter1986C

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Caring1

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thesmokingman

RJARRRPCGP

twicksisted

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Zach_01

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Bones

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FireFox

The Power Of Intel

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Motherboard	MSI Z390 A PRO
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Audio Device(s)	Audioengine A5+ Speakers
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Mouse	Logitech G403
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Software	Windows 10 64bit

Processor	Ryzen 7 3800X
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Power Supply	EVGA 850 BQ
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