Iphone 4 Turned black and unresponsive?

Ok, last night i went to bed with my iphone plugged into the charger with about 40% battery. I wake up this morning and it is black. I tried to turn it on first, nothing happened. I tired to reset it, nothing happened. It just stays a black screen. I plugged it into the computer and the computer does not recognize the phone. Is there anything else I can try? I already tried resetting it with the home and lock button multiple times and nothing happened. I really need my phone today, and don't exactly have time to wait a week to get a genius bar appointment and then see what is wrong with my phone.

Water damage? Could try using another cable to charge it. If not apple is your only option.