68 iPad has a black or frozen screen
Force-restart your device. On an iPad with a Home button, press and hold the top and Home buttons until the Apple logo appears on the screen; without a Home button, press and quickly release first the volume button closer to the top button, followed by the volume button further from it, then press and hold the top button until the Apple logo appears. Connect its mains charger, leave it an hour and try again. If its gets stuck, connect to a Mac or iTunes on a PC and repeat the keypress sequence to enter Recovery to update it.
