stanley garage door opener model 2200 will not run

my mid 1980,s stanley garage opener problem started when the 2 motor mounting bolts came out and the motor hung from gearbox when door opened – door completely opened but would not close – i replaced mounting bolts but motor does not run even with chain removed. when closer button is pressed, i hear faint hum but no attempt from motor to run – after approx 10 seconds ,clicking sound starts as if door is obstructed. any diag appreciated