Iphone 4 on with black screen?

I tryed the hold power/home screen 10 secs thing and didn't work i plugged in charger, didn't work, and i did not drop it or anything please help thanks

Added (1). I can't charge it because my iphone only charges when it is off because my iphone sucks

Well if the iphone is on, then eventually the power will be all used up right? If that doesn't work, try syncing it up to your computer via the cable. Then backup and restore it.

I'd recommend resetting it from itunes, if that doesn't work, bring it to an apple store.