Well im guessing its the motor if u hear no sound. If it was the regulator than u would still hear the motor pushing up and down. What u can do is just take off the door panel and put your hand in there and feel around too see if the cables on the regulator are broke. This Is an example of a broked regulator. The cables bind up like this so if u stick ur hand in there u should be able to feel if the cables are binded and broke. But im pretty sure its the motor.
