HELP! Computer starts then immediately shuts down. I've tried everything but a different cpu.

[Captainsomething]

I've tried literally everything except a different cpu.

 

The computer turns on for not longer than 1/10th of a second and immediately turns off. To turn it on again (for that 1/10th of a second) I have to flip the switch on the PSU off and on again. The error lights all turn on for that 1/10th of a second then immediately turn off. No matter what I do, this is what happens every single time I press the power button.

 

No fans spin, obviously with how quickly the computer turns off they don't even have time to spin.

 

The power light on the GPU is solid white like it should be when the PSU is switched on.

 

I bought the same motherboard a second time thinking it was the problem, but the exact same thing happens every single time.

 

System specs:

- AMD Ryzen 3700x

- GPU EVGA 1080 hybrid (taken from my working computer so I know it works, also tried my Asus gtx 970 strix)

- (2x16gb) 32gb gskill trident z neo 3600mhz (also tried a stick of ddr4 3200 gskill from my working PC)

- X62 nzxt 280mm liquid cooler

- Motherboard MSI mpg X570 gaming edge wifi (I've bought 2 of them)

- PSU EVGA GQ 750 (also tested with a pay I know works EVGA Supernova P2 750)

- Samsung 970 nvme m.2

- Case: meshify c

 

What I've tried: 

I've switched in:

- the psu with one from my working pc (and all cables)

- the graphics card to the one from my working PC

- the ram from my working pc

- the CPU air cooler the CPU came with

- I've changed the case to an older case I had

- switched in the data ssd from my working computer

 

I've reseated:

- all PSU cables

- CPU

- RAM

- GPU

- nvme m.2

 

I've been googling like mad for the last week trying to find a solution, about to rip my hair out.

 

The only thing I can think of is the CPU being bad, but I've not heard of anyone with a bad Ryzen 3700x

 

Any insight would be helpful, as I feel like I've tried everything.

[MartinKweh]

is the 8 pin(4+4) connector in the GPU (6+2) ?

[Captainsomething]

1 minute ago, Martin2132 said:

is the 8 pin(4+4) connector in the GPU (6+2) ?

Yes. On the gtx 1080 both 8 pin GPU cables coming from the power supply were connected, on the 970 the single GPU 8 pin cable is connected.

[Captainsomething]

The 8 pin to the CPU on the motherboard is also connected. This motherboard has an 8 pin and 4 pin CPU, only the 8 is connected as the 4 pin doesn't need to be connected. The correct PSU cables were connected for both CPU to motherboard and PSU to GPU.

[MartinKweh]

no i mean, both the CPU and GPU power connectors are similar. you may have switched it so im asking if you did or didnt.

[Captainsomething]

15 minutes ago, Martin2132 said:

no i mean, both the CPU and GPU power connectors are similar. you may have switched it so im asking if you did or didnt.

No, I'm using the correct cables for both CPU and GPU, and they're plugged into the correct ports on the PSU, it says on the side of the cable connector which one is the GPU cable and which is the CPU cable.

[Captainsomething]

Update!

 

It was the CPU! I'm returning the ryzen 3700X and got a new 3700X from Amazon. I still have them both as I wanted to swap back and forth to see if it was truly the CPU and it was. My luck! As I haven't heard of anyone with a bad CPU. There were NO bent pins on the bad one, it looked perfect even after a very close inspection.

 

So happy

this was such a massive pain swapping out each piece to see what the problem was.