Help iphone 4 is on but the screen is black?

Help. I was at the fair and I took my phone on a spiny ride and once I got off the screen was just black but the phone works. My phone is really shattered, but that didn't make a difference before.

You'd be amazed what centrifical force can do. Lmao

do a hard reboot… If its still black, do a itunes resotral or call Apple…