when i dropped my bikecouple years ago, i've always had a problem starting my bike. i dropped it on the left side, thus the left handle hit and clutch lever. then the bike just wouldn't start when i do my regular starting procedures. turn on the red button on the right handle bar, pull the on the clutch lever, press the start button.
then i finally figured it out. i messed up my clutch lever it seemed that my clutch lever doesn't pull the cable enough to makeit start. so now everytime i pull on the cluctch lever i have to really press it with the handle bar and pull it upwards at the same time.
oh by the way that's if your doin the starting the bike and you hear no sound. check out your clutch system. check your clutch cable maybe its not pulling enough or like paul said maybe the clutch bolt came loose hehe