Could a pin on an atx power cable kill a motherboard?

[Captainsomething]

I build a new pc, after trying to power it on the first time and doing some troubleshooting, I noticed a pin was slightly pulled out on the atx power cable extension. I removed the extension but the computer still didn't power on. I switched the power supply to a different one that I know works, but still absolutely nothing happens when I try to power on the PC. Double checked the power button connection and it's connected correctly.

 

Could that have killed the motherboard or was it likely DOA?

[Alex Atkin UK]

Probably not, so long as it wasn't touching something else sending the voltage down the line.

I assume you are testing without the extension?

[Spotty]

What are your system specs?

[Captainsomething]

System:

-AMD 3700x

-GPU EVGA 1080 hybrid (taken from my working computer so I know it works)

-32gb gskill 3600mhz

X62 nzxt 280mm liquid cooler

-Motherboard MSI mpg X570 gaming edge wifi

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

Case: meshify c

 

I tested without extensions, then I switched in my PSU from my working PC along with its cables. Removed everything from the case and tested it outside the case, switched the ram from my working PC, it's gskill 3200 ddr4, reseated all cables, reseated ram again, reseated gpu, reseated CPU. 

 

The computer turns on for not longer than half a second and immediately turns off. To turn it on again (for that half second) I have to flip the switch on the PSU off and on again. The error lights all turn on for probably 50ms, they basically just turn on and it turns off.

 

I'm guessing at this point it's the motherboard.

 

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