I have a samsung galaxy 10.1 2014 edition tablet. My daughter was watching videos on it I thought she drained the battery. At first it looked like lights on the sides were out. So, the screen was brighter in the middle than on the sides. I decided to turn it off and then on again. When I did that it turned on, but the screen is all black. It responded to touch and I can hear it, but nothing. Any ideas or is it toast?