@PeteFly82 G'day Pete,
I think so. Both levers are approximately in the centre and if I hover the mouse over them, it shows "Open".
I've got a work-around at the moment by loading another twin prop aircraft, starting the engines and then loading the HS 748 over the top of it. I can then set the Propliner to a Cold and Dark state and save the scenario and it starts just fine. I'm going to guess that my original problem was something to do with a not-quite-right panel state.
Now if I could only figure out how to open the cargo door and extend the rear air stairs! All I can manage right now is toggling the rear pax door. Pressing Shift-E and adding "2" or "3" doesn't seem to work for me. Unless I'm doing that wrong somehow!
Cheers mate
Warwick