1, in the presence of white apples, press and hold the power, black screen to let go, and then press the power to see if there is no response.
2, if still not to press the power and home and then wait for 10 seconds or so to see
3, if the above method can not restart the phone, we could restore the system
1, installed in the computer and play at the end of itunes, we first press the "home button" + "power button" 8-second forced shutdown-shutdown after the long press "home" key 8 seconds--through the USB cable to connect the computer
2, itunes will pop up to detect a recovery of the iphone settings, and then we click "OK":
3, now in the itunes interface, we press the computer keyboard SHIFT key on the "restore" +itunes, select the firmware (this system can be downloaded first):
4, then we select a good system and then click on "Open" then itunes began to go into the brush machine, back to a new system:
5, restore the good we click "set to New device" and then on the phone to activate it.