Question Why do I have horizontal green lines on my monitor?

Mar 10, 2019
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When I plug my DisplayPort cable into my computer and boot it up, there are horizontal green lines all over my screen, how can I fix this issue?
 
Mar 10, 2019
3
0
10
I have a Dell 2417dg monitor, 165hz, 1ms, g-sync, i9 processor, MSI Geforce 2080ti, Maximus XI Hero motherboard, I haven't overclocked yet, and it also happened with my PG258Q 240hz monitor