Was it plugged in on the side of the machine when it fell? There is an outside chance that the fall had nothing to do with the electrical issue. It could be a bad plug/wire. Unplug it from the outlet or powerstrip then unplug it from the machine. Plug everyting back in, and try the power button, again.
If this doesn't work,....Try placing your machine on its side on a towel (so screws don't run away)...unscrew the base and see if you can determine if the plug is broken or wires are loose at the plug in area inside the machine. It could be an easy fix, otherwise, the cost of a repairman will be what the machine is worth. How far did it fall? If it fell hard, the power button could be damaged. Best wishes.