Keep in mind that the start process is variable at best. Some times you hold the button till it starts, some times only just a fast click to start other times hold for a few seconds then release to start. When you restart after a full shut down try all the different techniques before you give up on the start.

Another thing I have found is the plane is sensitive to the amount of memory remaining. As the reserve memory goes down the ability to start the engines seems to diminish. I always reboot the computer to insure maximum available memory before starting the C130.

Dave