Ok i am having some issues with my iphone 4s HELP

Ok so i dropped it today but not at all hard and i picked it up and it wasnt cracked or anything. but i couldnt turn it on like the screen was black, but when i plugged it on it still vibrates and i can still like talk to siri. so i waited and i tried to restore it that didnt work. then my dad hit it against its leg and this thing came up on the screen that said to plug it into itunes so the screen is fine. so i tried plugging it into itunes but when i plugged it in the computer didnt even sa my phone was plugged in neither did itunes, but it still makes that noise when i plug it in?

HELP?