I rarely use my friend's Macbook Air 13', but today when I opened it for the first time in days, the left side of the screen showed some issues. The screen was slightly tearing and would flicker annoyingly whenever I scrolled. I left it alone and put the computer to sleep, only to find that the issue grew bigger as seen in the photo. The machine was not physically harmed. I did not drop it, pour water on it, or applied pressure. Nothing. It was completely fine the last time I used it and this happened for no reason whatsoever. I did perform a SMC reset because the machine was being annoyingly loud with its fan as it always has. Anything I did with this machine was routine and should not have contributed to the monitor. Could anyone give me a solution to this problem? Please don't tell me to go to the Apple Bar or send it for repairs. Repairs are unreasonably overpriced and my warranty is long expired. Google told me that this is potentially a GPU glitch and that Apple has yet to find a solution for it. Please let me know. Thank you. EDIT: My bad, I totally forgot that I cleaned my Macbook Air with a damp paper towel with Windex, and some of it might have seeped through the keyboards. Thank you, calvol!