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First try installing the OS on the phone either reinstall the old os or try and upgraded version.
A.) Remove the battery, Plug in( if keyboard still does not work try the following: 1.) Applications 2.) Options 3.) General settings
Note: your phone may have a different os than I pulled the above information from just try to get to general settings and then hit blackberry button for wipe handheld option. Don't forget to backup your contacts etc before doing this.
Depress the blackberry button (button with all the dots on it) then select wipe hand held. Be careful as this will erase possibly everything on the handheld
If none of the above work to get your keypad working it will need physical repair.
This would mean that at sometime your phone got wet by some form of liquid.I don't know if u could do this but the phone needs to be opened and your keypad needs to be lifted(the one on the pcb or main board) and cleaned thoroughly by a spirit solution that would evaporate and then replaced.you'll have to clean the pcb side and the contacts on the actual keypad and that should do the trick hopefully.try not to disturb the adhesive on the keypad because you would need to reseat when u r finish cleaning. thanks !
I don't know but mine's doing the exact same thing. Mine also keeps the screen on almost all the time, sometimes it turns itself on and back off and back on for hours. Once every button EXCEPT the red button worked... and once only the top left button worked, so i could answer calls but couldn't hang up. My friends enjoyed messing with me for that one.