Try clicking the starter button once, then clicking it again and holding it down (so you get the instrument panel up), let us know what you see.  In the aircraft you have to hold the starter button in until 60% to start the engine, so I just click it once to start the cycle and hold it in again to keep the engine gauges up and for realism.  Worth a shot.

If that doesn't work check all the simple stuff:
Main fuel tank boost pumps should be on
GTC should be on with bleed air open
GTC GEN should also be powering the ESS AC bus
Engine bleed air valve should be open

Also, I've noticed sometimes when switching from aircraft to aircraft that fuel won't be in all of the tanks of the new aircraft.  Double check that your respective main tank has fuel in it (if you're starting in tank-to-engine).