My Iphone has a black screen but still vibrates and charges?

My iphone 4s is not working, it had a black screen but the vibrate button still works, so does the siri noise when i press and hold the home button down, i have tried the simple reset with on/off button and home button together, nothing happens, i tried plugging into my computer, the iphone comes up on itunes but my iphone still is black, it makes a charging noise or vibration when i plug it into the wall or the computer, when i dropped it, it went black so now i don't know what to do, and it has no cracks.

The screen is broken but the phone still works if you go to a mac store they can fix it most likely

Hold home key for 10 secs then let go

Did you try taking the phone and throwing it against the window hard?