Hello Dane,
If you have a buzzing sound coming from the motor but nothing moving the chances are there is thread stuck in the raceway, to make sure the motor is working release the stop motion as if to wind a bobbin and see if the balance wheel turns, if it does then stuck thread is probably the problem, if you post on here again please give me your make and model it will be easier to sort out any problem.
Ken
drivewithken, February 2010