原帖由： oldturkey03 ,
Try a soft reset first: 1. Press and hold the Sleep/Wake button on the top of the unit until a red slider appears 2. Drag the slider. 3. Press and hold the Sleep/Wake button until the Apple logo appears. If a soft reset doesn’t work, try a hard reset: Press and hold both the Sleep/Wake button and the Home button for about ten seconds, until the Apple logo appears.