I have an electrical issue. I have taken my car to a mechanic but he was unable to find the issue. My windows, doors, radio, dvd system and interior light do not work. All other elecrical functions work( head lights, brake lights, power seats, side mirrors and odometer). The mechanic hooked up his sensor dector to the car and everything turned on. We started to drive home and the windows, doors, radio, dvd system and interior light turned off. What could be the issue?