03-21-2010, 12:50 PM
Join Date: Jul 2005
Location: Florida Panhandle
Carrier: T-Mobile USA
Post Thanks: 29
Thanked 540 Times in 524 Posts
Have you exposed it to moisture? Even a sweaty pocket is known to cause problems.
Have you dropped it?
Barring hardware problems, consider wiping the device and reinstalling the device software.
Find the two articles on using JL_CMDER at blackberryfaq.com. Use that to wipe.
See the sticky post on latest OS for your model blackberry. Follow the instructions carefully to reinstall the device software.