To Restart/Reboot your Blackberry without taking your battery out, complete the following steps.

1. Press and hold the Alt key (1)
2. While holding down the Alt key, press and hold the Right Shift key (2)
3. With both of those buttons still pressed, press the Backspace/Delete key (3)
4. When the screen turns off to indicate that the BlackBerry smartphone is restarting, you can then release the keys you have been holding.