LG GT540: dark screen?!?!

[Jannitf]

Hey! I am in desperate need for help! Today i dropped my phone and my battery felled out. After, when i had put it in again, i tried to turn it on, but i wouldn't! The screen isn't black, but very dark/blue, the 5 symbols (home, back, and so on) are lighting up and after a few seconds you can hear the start sound/melody, but still a dark screen! Anyone who can help me????? Please, it is very important!