Screen flickers and lines on startup

May 24, 2018
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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?
 

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