04-07-2013 08:47 AM
Welcome to BlackBerry Support Forums
Have you tried a battery pull restart yet ? If not then first step do it by removing the battery while your device is Powered On , wait for atleast a min. then reinsert it back after reboot please check if it works.
If it fails then can you confirm if you recently installed any application before this issue appeared , If it is then Uninstall that particular application , it might help :
KB10040 :How to view or remove installed application on a blackberry smartphone
04-08-2013 06:56 AM
Then you should try an OS reload to rule out any software issue , refer to this Knowledge Base for help :
KB03621 : How to Reload BlackBerry Device Software and application using BlackBerry Desktop Software
Try that it might help unless its an hardware issue.