Power Issues I've Never Had Before. PLEASE HELP!

[Yeti1818]

I started building this computer for a friend yesterday. Got it all put together, hit the power button and....... nothing. No signs that power is even getting to the board at all.
So I started trouble shooting. Tried out the new psu on an older computer and it works. Tried different power cables, nothing. Tried a different mobo (same model), nothing.
Made a make shift test bench, and set it up with bare minimum components needed to start trouble shooting ram sticks, etc.

I can't get the board, fans, any leds, to show signs of getting power.

Truly at a roadblock right now :( 

Any of you smarties have any ideas on what might be causing this or other forms of troubleshooting I haven't thought of? 

System Specs:
AMD ryzen 3900X
Asus x570 TUF Gaming Plus
CORSAIR Dominator Platinum 32GB @3000
MSI 2060Super
EVGA 850watt Supernova G2
Intel 600p M.2

[Radium_Angel]

1 minute ago, Yeti1818 said:

Truly at a roadblock right now

I see a 4-pin connector on the mobo without power.

Also, where is the CPU fan?

[Fasauceome]

Just now, Radium_Angel said:

I see a 4-pin connector on the mobo without power.

yeah but that won't stop the PC from turning on