faulty blackberry torch 9800 !

Faulty but working blackberry torch 9800 £70 O.N.O The phone is on T-mobile / Orange Part of the button on the front of the phone has fallen off but the buttons can still be used. The screen is faulty it sometimes works and it sometimes does not. What I usually do to make the screen work is slide the phone up and down a few times and press the lock button and it usually allows the screen to work. The screen usually works best when slid down but on occasions will work when slid up. Everything else works fine, phone calls, texting, bbm, internet etc. I think something might have came loose in the phone that connects the screen to the phone but im not sure. Ring or text me on 07931570374 if your interested in buying