Try these steps, one of them will work for you.
1) Pull out the battery for 30 seconds and replace.
2) Go to Options - Security Options - Security Wipe, and wipe the phone.
3) Restore the OS, Connect your computer to desktop manager and click update.
4) Get a new [http://www.blackberrypartscenter.com/Blackberry-Bold2-9700-Original-32MP-Main-Camera-_p_46.html|Blackberry Camera Replacement], but be careful; i tried it once and it was very difficult, so if your not sure how to replace the camera, i think the best idea would be to go to a professional technician.