High Pressure starts on the ground work just fine for me?

1.  Battery On, Parking Brake on (CTRL + .)
2.  Make sure power and air are ON (shift 2 panel)
3.  Turn the switch to EXT POWER (not sure it's label, below the ground power switch on the FE's upper panel).  You should see air pressure rise and electric turn on.  Be sure the DC bus is on ESS.
4.  Open the cover switch and select HIGH PRESS (overhead between engine start switches).
5.  Switch engine 3 to GRD
6.  Watch for about 18% N2
7.  Introduce fuel
8.  Once engine starts and stabilizes, go and switch the switch in #3 to Gen 3, and then switch the switch in 4 to LOW press.
9.  Start eng 4, 1 and then 2....

Thats a quick one off the top of my head?!