My ipad suddenly stopped working. The light works but nothing appears on the screen. I tried resetting but that doesn't work and the power button doesn't work.

My ipad suddenly stopped working. The light works but nothing appears on the screen. I tried resetting but that doesn't work and the power button doesn't work either. When I plug to the computer, itunes say it can't connect to ipad and to enter pass code. But nothing is displayed on the ipad screen to enter the password.