Unable to start the APU with batt power only. This is crucial when no external is available to set up the aircraft end main engine start.
Try this procedure.
Fuel pumps on, (may work without, I didn’t try)
Emergency power to auto.
Plane should power up, engines should start.
This works for me every time.
Are you using the checklist? I just started cold and dark in the 747 with no external power, no issues at all.
I know (operate) the 747 (real live) sim didnt work according the normal checklist. Will try again after the up-date,
Thanks for your reactions.