There are a lot of Apple users tried to update the phone, the phone will not turn on the phone screen or a connection icon appears itunes, and then this happens, the phone system has crashed, you can try the following methods to repair.
After you install on your computer to save a brick software, itunes software being downloaded and installed, the phone connected to a computer with the original data cable. This time the phone will automatically recognize an ongoing recovery mode handsets, if not prompt, then press and hold the power button turned on in the off state, the Apple logo screen appears, do not release the power button, then hold down the home button of the main screen, wait for the screen is blank, then release the power button, while the main screen home button has not let go until the computer's itunes software detects a mobile phone is in recovery mode.
In itunes iphone restore window, click the button, wait for itunes networking will prompt detection and recovery after the factory settings, click Restore and update, then step by step operation according to prompts on it.