Screen flickers and lines on startup

gaute.vgs

Prominent
May 24, 2018
14
1
515
every time i start up my pc i get some white/green lines on the bottom of the screen that stays there for like a couple of minutes. also, in games every so often i get a flicker on the screen, usually this happen when i move the screen fast. the flicker also happen on my other monitor, but just when gaming, not when startin the pc/screen. what could it be?