cant reset it could be either high voltage fuse, magnetron or high voltage capacitor i would check fuse 1st but if you dont know what you are doing get expect to look as these can kill you will need to Discharge The High Voltage Capacitor,The high-voltage circuits in a microwave oven generate from 3000 to 5000 volts DC never live test
airkool at hotmail.co.uk, January 2011