I let my sister use my MBP for one minute and I come back and there are green, pink, and black boxes on the screen. This happened when she clicked a picture in PhotoBooth. I couldn't exit it and everywhere my cursor went, the boxes appeared. I shut it down and restarted it and now everything seems fine. It worked all the time for me, and it only happened with my sister.
Is anything wrong with it?
Is anything wrong with it?