Green screen, Random Reboot, Reboot Freeze.

I've had this Phone since Oct. of last year. It all began when I accidentally dropped it on a parking lot. a small crack on the back was of no concern, but something else began the cause. When I upgraded my BB to 06.15.00, the battery drain was the #1 problem. Still couldn't find the problem. Last Monday, I got the bright idea that I would "restore" but ended upgrading to iOS 5! I de-evoled back to 4.2.1 the day after I figured it out. Currently its suffering from a reboot loop and yet found a solution to this. Can anyone help? (T-Mobile 4.2.1 06.15.00)

P.S: The Dock is missing a plastic piece which has some 'fingers' (some of these are bent). And I have no vibration function.