Ok, this is really bad. I was using my iPhone 4 last night. I clicked the home button, then the screen turned a white-gray colour for like half a second then it turned black. It won't turn on or anything. It wasn't the battery, because it was on like 63%. My phone wasn't jailbroken either. Does anyone know what happened to it? Should I take it to AT&T or Apple? Also when I plug it in my wall charger, it doesn't start charging, and when I plug into my computer and open iTunes, it doesn't show that there's a iPhone connected.