[SOLVED] PC doesn't start despite peripherals receiving power

[patrikstrollface]

So I just upgraded my build once again , when I got done, I checked if I've connected all the necessaries, its not my first build so all the panels and cables are stuck in their correct pin/slot. When I plugged in the ac and flipped the switch, all fans flash for a millisecond and my peripherals turn on. The psu doesnt turn on, so, I short it, turns on just fine. Cant short the motherboard though. I'd be thinking its a faulty motherboard to be honest, but I really hope not, so thats why im here.
It doesn't start at all, like, I can spam the power button and it's doing nothing, same goes for shorting the power switch pins
Thanks in advance

 

[Vic 40]

Upgraded with what from what?

 

[patrikstrollface]

Upgraded with what from what?

Upgraded with a b550 Vision D from an AX-370 Gaming K5

 

[Vic 40]

Which cpu?

Checked pins to see if any got bend?

 

[patrikstrollface]

Which cpu?

Checked pins to see if any got bend?

3900X And no, nothing bent. I also used an anti static band, so it does wonder me a bit.

 

[Vic 40]

Like you said, might be bad motherboard you got. If still having the old should you be able to continue work/game and rma. Well rma would be good anyway.

I guess that the 3900X was already in the old motherboard and isn't an upgrade as well?

 

[patrikstrollface]

Like you said, might be bad motherboard you got. If still having the old should you be able to continue work/game and rma. Well rma would be good anyway.

I guess that the 3900X was already in the old motherboard and isn't an upgrade as well?

Yep ive used the 3900x on my old one. Oh well, rma it is then, thanks for helping mate!