screen goes unreadable upon hackintosh installer boots

I got HP elitebook 820G2 which has the supported hardware for Hackintosh. I already configured my BIOS according to Hackintosh instructions.

I'm first time installing Hackintosh, read allot on the communities but still failing. Whenever I choose "boot Hackintosh" installer from the boot menu, the screen goes just consists of lines and signals - contents are totally unreadable! the lines remains moving for few minutes, then screen goes blank, and then another sets of lines appears in different colour.

I don't know what's happening on the computer, because nothing is readable on screen. Can you please assist me how to fix this screen issue? I tried with hisierra and Success' href='/2020/12/install-macos-mojave-on-supported-pc.html'>Mojave, similar behaviour.

Author: @abdullah5490