I cleaned my screen with a proper cloth,(as my husband plays solitaire a lot,) before I was about to watch a video. I was going on a flight and was looking forward to passing the time watching a film. Went to watch and nothing but a black screen. After several attempts, no luck.I hadn't taken my computer, so couldn't try and sync . On my return I had to restore and then put everything back on again. It happened several times again, so eventually got apple to change it, but the same thing has just happened. It just seems to coincide with me cleaning the screen. Has this happened to you.