My LG monitor got some grey vertical lines over it?

p4p1

New member
It looks like lines are made of hundreds of dots put together. I never had any problem with it before, it's about a year and a half old. I was just playing counter-strike (video game) and when i turned it off i noticed the lines. Any ideas what's causing them? If you need some more information, just tell me which ones and i'll add them.
 
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