2013-02-10 6:26
2013-02-12 15:10
Have you tried performing a powercycle? (turn off the phone, remove the battery (include the memory card), put them back in then turn on the phone)
You may also try to perform a soft reset. Refer to page 111/114 of the user guide.
If both didn't help, you may try to re-install the software of the device using Nokia Suite.