I have a KitchenAid Electric dryer and it will not start. When I push the start button it make a very slight buzzing sound but will not start. When I unplug the dryer and remove the back and press the start button it appears that the switch works (moves forward and returns) but when I plug it in and push the start button the switch moves forward but does not return. When I turn off the dryer the switch releases. Any ides on the problem?