After update (July 12th), lines go across my screen

After, I updated my computer, I did it on July 12th, I'm pretty sure the update came before it, I just never did it. When I started using firefox and itunes there would be lines across the top of my screen. Don't know why, but any ideas on how to fix it (other than going into an apple store).
Jon

I would post a picture of the screen but I do not know how to do that

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