I just wanted to add to this that I'm sufffering the same problem. Battery switches don't seem to have any effect on the aircraft. It just stays cold and dark. Flicking switches on the overhead etc. all seem to work (lights and passenger sign sounds for example). It just never seems to actually power up. I have tried removing and a fresh install. I haven't flown for a couple of weeks so unsure if this has happened since an update or since re-installing the aircraft through the Ini-manager.