I'm having trouble with my iPhone 4S. It rarely turns on and whenever it does, it shows a gray light in the middle of a black screen with some kind of halo around the light. Also, whenever I hook it up to a charger, it makes the charging sound over and over and over, every 7 or 8 seconds. I was wondering if anyone has/had the same or similar problem? If so, any suggestions, other than repair? Thanks in advance.