原帖由： smithron4 ,
Have you tried a restarted? If you have not try this: Simultaneously hold down the start button, in the landscape position middle of the right hand side, and the off button, upper left hand edge. Hold for fifteen seconds. The screen will go dark and then a white Apple with a bite out of it will appear on a black screen. It may take a few minutes, then the start screen appears. Sign in and see if all systems are working as they should.