Have this micowave plugged into a gfi. Had plugged a all-in-one unit into another plug. We were testing the all-in-one unit to see if we could turn both burners on without it tripping the fuse. We heard a loud bang and then our lights went out in the house. Immediatly unplugged the all in one unit and reset the breakers. The light on the micowave was on during this time. When we turned the micowave on it then made this loud noise.