Question Horizontal lines across the screen and flickering

Streelo

Honorable
Jan 29, 2015
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10,510
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After turning off my monitor for 1-2 hours at a time if I am turning it on again then temporarily the size of the windows is huge and I get flickering white lines which slowly take a minute to go away and then my display goes back to normal

Update: Now the white lines don't seem to resolve themselves and flickering is still there even without DVI signal and in bios. I think it's the monitor thats the problem but pls let me know as I'm not the best in this.. have attached video - https://linustechtips.com/main/uploads/monthly_2020_05/WhatsApp_Video_2020-05-04_at_3_00.56_AM.mp4.a2e4e3a0aabc6e4e4735b6bf966eb1c2.mp4

LG monitor 22M38D - B
 

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