I would try to remove the battery. Once the the battery is out remove your SD card and put it back in securely then put the battery back in and restart the phone. If this does not work you may have to completely wipe and reload your OS. BTW the manual for your phone is available at http://docs.blackberry.com/en/smartphone_users/deliverables/7033/userguide_bb8320_gprs.pdf and may help you to determine what is going on further. Good Luck