View this info if your device is unresponsive, frozen or won't power on or off.
Press and hold the Power button (located on the left edge) for approximately 20 seconds or until the device power cycles. Press the Power button again for 2-3 seconds to restart the device.
Related Topic: Unfreeze Your Device
If the Power button method doesn't work, charge the device for a minimum of 4 hours using the supplied charger or 12 hours if using a different charger.
Refer to Power & Charging Issues - Non-Removable Battery Devices for additional info on resolving power issues.