Question My pc stops all display to monitors but eall compents stay on

Dec 28, 2020
4
0
10
i9-9900k
Asus prime z390-a
Corsair vengance 16gb 3600mhz
Amd 5700xt
Corsair CX 750m Bronze
Everything is brand new apart from gpu because old psu blew .
My problem is that my monitor just stops displaying any thing and im forced to rest my pc.
Any advise????