(Note: I am going to post this in both PSU and Motherboard, because at this point I am uncertain which is the cause of this problem)
I recenty built a PC with the specs:
Mobo: ASRock B550 Phantom Gaming ITX/ac
PSU: Cooler Master V650 SFX
CPU: Ryzen 7 5800x
RAM: 16x2GB Team VulcanZ DDR4
Storage...