Screen has lines running through it, is it worth replacing screen?

Screen has lines funning through it, is it worth replacing screen on 2009 iMac?

What do you mean by lines running through it?  There have been users with vertical lines, sometimes blue, or yellow, or pink, or combinations.  Those have all turned out to be a bad graphics unit chip that the Apple store techs were able to remove and replace without replacing the entire logic board.
Take it to an Apple store genius bar and have the techs test and advise on how to resolve this.

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