About this issue the Boeing 777 seems to have errors during Manual Startup. For example I spooled up Engine #2 after powering up the strobe lights and other lights? too seems to come on and you are not suppose to turn it on unless you are going to takeoff, And also one more thing can't I power the hydraulics without turning on the engine? Because I'm pretty sure in real life you are not allowed to turn on your engines while at the terminal itself (hence why we have pushback) but I can't really turn without turning the engines on.
Sorry just love realism so much lol, But I do thank everyone who improved the Boeing 777 over the years.
EDIT:
The hydraulics problem has been solved with a simple modification with the Hydraulics.nas file of the Boeing 777.
To install it just go to your aircraft directory > Boeing 777 > Nasal then paste the file there overwrite the old Hydraulics.nas file.
I'm using FlightGear 2017.1.2 (Will be upgrading to 2017.1.3 tomorrow)
Link: https://www.dropbox.com/s/e1gb2gg3kiakl ... s.nas?dl=0 (Credits to: BEL ISAAK)
All thanks to BEL ISAAK