DROID MINI / DROID ULTRA / DROID MAXX by MOTOROLA - Soft Reset (Frozen / Unresponsive Screen)
View this info if your device is unresponsive, frozen or won't power on or off.
This device has a non-removable battery. This process can be used to simulate a "battery pull" when the device is unresponsive, frozen, or doesn't power on.
In most cases, a soft reset won't affect data on the device, unless the battery is very low.
Press and hold the Power button (located on the right edge, above the volume buttons) until the device powers off (approximately 10 to 30 seconds) then release.
Allow several seconds for the reboot process to complete.