Nooby,
Battery starts only for us for now - so BUS TIE is ON for #2.
Since we moved to a different hangar we have an ongoing problem with the 3-phase supply so GPU will light the dials but won't start it.
There was a suggestion that the MCDU was defective so we replaced it under warranty but we're back to square one since. In practice, we just pull the CB to re-cycle and off it goes but nobody has an answer so far.