I have a 7105t and none of the buttons work besides the click wheel, but the click wheel will only cycle to the messages and keyboard lock, and when i click the click wheel it doesn't work. I have tried connecting it to my computer and erasing all the stuff on it but it says when i go in to application loader, that there are no applications are on this device. DOES ANYONE KNOW HOW TO FIX THIS?

Have you tried pulling the battery while the BB is running? It's the great equalizer!

i have tried this and it still doesn't work and it still has the same problem

Does the desktop manager show it as connected? If so, do you have a back up of it on the system from when it was working? If so, I would try to reload the backup.