PC running but monitors are black

[Tabbott]

I recently built a pc and it was working great for two days. I was playing call of duty when the screens went black with no audio and my pic wouldn’t turn off with the power button on the tower so I hit the psu switch. Now I can’t even get a signal on my monitor and the pc starts and all lights/fans work. There is no error light on my motherboard. I have reseated everything, tried a different stick of ram, tested my gpu in another pc (it works), cleared cmos, different monitors/ cables. The only thing I haven’t touched is the cpu. None of the usbs work and the power button on the case only turns the pc on not off. My guess is the motherboard? But does anyone else have any other ideas?

Specs:

Asus b550 plus board

Ryzen5 5600 cpu

Rx 6800 gpu