i'm using a bb 8300 curve, was using it earlier tonight then when i was about to use it again and bbm someone, screen was black, no led lights flashing. the batt was almost drained when i got home so i charged it. thinking it was a batt problem, i took batt out and put it on my other bb, the 8520. batt worked well. tried putting it back to the 8300 but there was nothing. called help desk and they said it could be hardware prob. but i didnt drop the phone, didnt do nothing. was working perfectly before i put it aside. not sure whats wrong or what couldve happened. its just DEAD. Help anyone?!