I never lost 120v power, or 12 volt power. I still had TV, fan,stereo/dvd combo, all 120 volt appliances. When 120 was disconnected, all 12 volt lighting still worked. The only two things that are not working when running on 120 volt or 12 volt is the air conditioner/furnace(120 volt), an the water pump/water heater switch (12 volt).
All fuses were checked and not blown. Heck I even replaced all DC fuses with new ones as sometimes fuses go bad without indicating failure. This one is really stumping me because it was not isolated to a single power source.