02-26-2013 10:16 AM
Hi and Welcome to the Community!
Depending on what occurred just before this behavior started, your resolution choices may be different. So, here are some guesses, since we don't know that information...
KB32814 After completing an Enterprise Activation the BlackBerry smartphone reboots to blank white screen
I recommend that you attempt to boot into Safe Mode:
It may take you multiple attempts to get the ESC key sequence (press/release/hold) correct, so be patient. When successfully into Safe Mode, think carefully...what happened just before this behavior started? A new app? An update? A Theme? Something else? Think carefully as the smallest change could be causal...and attempt to undo whatever that was.
Please try this sequence...note that, throughout the entire 4h15m process, your BB must remain connected to a known-good wall charger (not PC USB):
This has been known to "kick start" some BBs.
It is also possible that your battery or BB has experienced a problem...to test, this sequence is needed:
The results of this will indicate if it's your BB or your battery that has the problem.
KB27956 How to recover a BlackBerry smartphone from any state
Good luck and let us know!