Verify voltage to the machine. Make sure you hear a click when the door switch is actuated. Then unplug the unit and remove the lower access panel. On the exhaust duct, there is a white thermal fuse (AP3133489) that may have opened the motor circuit. Temporarily remove the two wires and slide the connectors together. Make sure the connectors are not touching any metal, then plug the dryer back in and test it. If the fuse was bad, it should start. If it doesn't, unplug the dryer, put the wires back on the fuse and then it's time to get out a multimeter and start checking the door switch and push-to-start switch.