One of the solutions offered above worked for me. I held down the off/on/wake up switch and held the volume up and down both. It did turn back on the screen. The tablet was on before this because I was getting email notifications and the camera button would annunciate. This began when I would leave it in the bed when I slept. I know I didn’t roll over on it but it must affect in is some way. I knew I was being careless. Thanks for the help!