Don't know if you guy's have tried this but it's worth the shot at it.

Start FSX and then select the Cessna 172, select the airport and parking position you would have selected for your c-130. Set time and season etcetera and continue to load FSX.

Once up and running turn off the engine and all lights and avionics switch. Ensure that it is a complete cold and dark cockpit.

Select your c-130 and then save the flight. Now go through your startup sequence and see if you are able to complete the flight without loosing any power to any of your systems.

Regards,

James.