Have yiu opened the case to see if any component where unplug or broken in the fall.
You say it does not turn on at all so I am assuming nothing happens when you press the power button or do you have any activity but nothing seems to happening on your screen.
If nothing at all happens (no light activity, no fans turning ect) i would check if all the connections coming from your PSU (power supply unit) are firmly inserted to the motherboard.
I would also check if the front panel connections (power and reset switch) are firmly inserted into the motherboard.
If everything is firmly connected and you still have no activity at all it might be your PSU that has failed. I do not know the brand of your PSU but most have a voltage switch in the back, so check if the switch is appropriately set to the right voltage for your country.
Other thing to verify is that your cards, memory stick are firmly inserted.
One last thing to check is your power switch button that might have broken in the fall, one thing you can try if the option is there is to switch your power button wire on the motherboard with the reset wire and use the reset button (if your case as one) to start up your computer.