QuickTime screen recording doesn't work.

I tried screen recording using QuickTime Player but it didn't work.

Then I turned on "iGPU Multi monitor" on BIOS setting but still doesn't work.

Also DVD player displays gray screen with any dvd movie.

I think it's something around igpu setting but i couldn't find out.

any idea?

My components are below.

/ASRock Z390 Pro4

/Intel Corei7-9700K

/RADEON RX VEGA56

/Success' href='/2020/12/install-macos-mojave-on-supported-pc.html'>Mojave 10.14.2 installed