Since this happened right after the laptop fell, I would suspect a hardware issue rather than Windows.
First, unplug the charger and any USB devices, then hold the power button down for about 20–30 seconds. Plug the charger back in and try turning it on again.
When you turn it on, do you see any power light, keyboard light, or hear the fan running?
If the laptop seems to turn on but the screen stays black, try connecting it to a TV or external monitor with HDMI. If you get a picture there, the drop may have damaged or loosened the laptop screen/display cable.
If you get no picture on either the laptop screen or an external monitor, something internal such as the RAM may have been knocked loose, or there could be motherboard damage from the fall.
I would suggest you take it to local repair place.