Greetings, This morning when I opened my Macbook Air 2012, the display had a faded white tint. No, it's not a brightness thing. I have it to maximum brightness but when I turned it down the tint went with it. I tried to ask my stepfather who is in IT though not so savvy with Macs. When I brought the laptop to him, the tint went away but then when I got it back to where I'm sitting it came back. It has so far, remained. What is this?