Chosen Solution
Glass cracked, unit in emergency mode
You need to give more info. I would suspect it just needs a new screen. Without all the info its hard to diagnose as it could be a few things. You could be stuck in DFU mode (pure black screen), the screen could be dead (normally would have some form of light on the screen be it lines etc), or a dead phone (not likely but depends on how far you dropped it). Try plugging phone into Itunes, this will state if its in recovery mode or not. If its in recovery mode try holding down the power & home button for 10-15 seconds and see what happends. If phone does not show up in itunes is dead (try charging for a few hours and try again) If itunes asks for passcode etc to be entered into the phone but you car’nt see anything on the phone then the screen is dead, replace the screen.
