Hi, it's likely that the belt has slipped off the motor. Remove the motor cover and check the drive belt.. Realign the speed sensor if it has been misaligned (next to the pulley). To get the belt to the center you will see two adjustment bolts on the very back of the machine that require an allen wrench to adjust. Whichever side the belt is going towards is the side you will need to tighten. The best way to do it is to turn it a half of a turn then try and run the machine. if that does not help then loosen the other side a half turn, continuing until it pulls that belt back to the middle. If after that, the belt still fails to move, it's either you have a faulty motor (if the motor is not working) or you need to replace the controller board that has failed...