Check fuses and try running it with the blades off.
Fuse is good and it moves with the blades off? Blades are bad. Doesn't move? Switch or motor. Open the hood and have someone listen closely to the gearbox, any whirring sounds? Motor is good, if it's not moving then the gearbox is bad.
Does it move on any position of the switch? Try holding the washers / mist setting, they usually move with that but nothing else. Try HI as well.