Specifications

iPhone 4 Troubleshooting — General Troubleshooting 28
2012-02-21
Restart
A restart safely closes active apps and processes, preserving any data in the process, forces the
device to close all open les, and powers o all hardware components.
A restart can quickly resolve a wide range of issues, including:
• App(s) unexpectedly quit.
• Battery life is shorter than expected.
• Hardware not performing as expected.
• Interface or apps are slow to respond.
• iTunes does not recognize or sync with the device.
Procedure:
1. Turn o the device: Press and hold the On/o button for a few seconds until the red “slide to
power o” slider appears, and then slide the slider.
2. Turn on the device: Press and hold the On/o button until the Apple logo appears.
Reset
If the device is unresponsive and restart does not work, try to reset it.
IMPORTANT: Perform a reset ONLY if unable to do a restart.
Key Points:
• Reset only when you cannot restart the device normally.
• A reset removes all power for a fraction of a second to power o the device.
• A reset does not close open les or save data before the device powers o.
• A reset can potentially cause le or operating system damage, requiring a restore.
Procedure:
1. Press and hold both the On/o button and the Home button together for at least 10
seconds, until the Apple logo appears.