I'm no mechanic, but it sounds like a problem between the starter motor (if you can hear it working) and its physical connection to the engine. Looking at the wiring diagram, fuse 3 leads to the side stand relay, so it's possible that water got into it and caused the fuse to blow. If the relay "thought" it had closed, that would kill the engine. Someone may come in here and say if it's possible that the sudden engine kill could cause anything to shear between the starter motor and the engine.
