Okay, if the motor runs but the sewing machine mechanisms don't, this might be one of those occasions that it's best to take the machine in for service. In many cases, the motor belt is located inside the machine and it's wise to take it to an authorized service centre for repair. Possible issues:
1. Motor belt is broken.
If you have easy access to the motor belt this is one issue to check and possibly replace on your own. However if access to the motor belt is not easily obtained, leave it to a professional to do.
2. Motor belt is loose.
If this is the case and you can access the belt, adjust it so that the belt is tight, but not overly tight.
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