Leslie S Oxford , MI February 16, 2018 Appliance: General Electric Microwave PVM1870DM3BB Ge Microwave Pvm1870dm3bb: No power at all. How to replace Thermostat (Microwave). Replaced the thermostat and it turned on and I have power again. 19 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes