its probably the video card. did you do anything to the video card?
it might fall down outa of your hand, that's what happened to me, and i got these lines in my monitor.
nah its the moniter cuz it has the lines on any computer i plug it to, i tried another moniter and it doesn't have the lines. so its the moniter not the video card.
it might be permanent but maybie theres a way to fix it.