There are problems with both Ipad2 and itouch5 today. Suddenly, the monitor needs to be activated, but the Ipad monitor can't be activated. Activate the service.
Back up the phone first (if it is best not to back it up, it is recommended to back it up with 9 1 assistant), then restore it with ituns: 1, and press and hold the power switch for 3 seconds. 2. Connect and press power+home when the screen turns black, and silently read 10 seconds or so. 3. Release the power switch and keep the home keyboard for more than 10 seconds, or longer, and the screen is black. When all buttons are released, the screen will be completely black and enter dfu mode. Opening itunes at this time will prompt you to restore your phone.