My iPhone screen is black and won't come on?

I dropped my iPhone in water about two weeks ago. My phone had been acting weird since then and today, the volume was going up and down on it's own so I turned it off. When I turned it back on, the screen stayed black. I know my phone is on because it vibrates when I plug it in and it vibrates when I switch the volume switch. I want to fix it but I don't know what's wrong.

You don't know what's wrong? Really? You dropped your iPhone in water and now it doesn't work. That's what's wrong. To fix it you throw it in the trash and buy a new phone.

Have you tried holding the home and lock button at the same time? Mine has done this before.

Thank you Sherry