I think it's buggered!
I guess you know that the rotor brake must be disengaged for start on Robbie's. Has the brake stuck ON? The microswitch on the brake itself could be knacked, thus not allowing the starter circuit to be completed. As for the clutch, again that could be the microswitch. I don't know how different the electrics are on the Raven2 compared to the original. It could be something simple like a short in the start circuit, however, my suggestion...
ask an engineer!