I'm no whizz at bike mechanics, you need Greenman to comment on this.. but does your electrics (horn, lights, brake light) all still work? then the battery is still charged.. sounds like something is cutting the ignition. have you tried bump starting it?? and have you tried starting it with the sidestand up.. there is usually killswitch on the sidestand.. but usually only cuts the ignition if the bike is in gear and stand down.
Apart form that... I'm clueless!! lol