Hi

I build a PC and everything seems fine up to a Q-CODE 02 point.
I tried to run without front panel sound and USB, 1 socket is taken by AIO anyway. Tried to run it with single stick RAM. Everytime I end up in BIOS setup.
I could replace GPU with 1050 and 4+4 CPU power with 4-pin only (book say don't do it) but I think all I manage will be a waste of time... I am not even sure what "AP initialization before microcode loading" might mean.

ASUS ROG Strix x570E Gaming - (v.3201)
Ryzen 5800X
Corsair Vengeance LPX (2x16GB) 3600 MHz
1080 GTX
Antec VP550P

I've found some people with 02 error but they reported no screen and/or on-board LEDs showing problems with RAM, GPU. Thats not my case.
I started thinking perhaps I should have 8+4 PSU or at least something more modern than I have. Should I try RMA and which components?