According to my daughter, the speedometer simply quit working after she hit a bump in the road. Several miles later the speedometer began working again. Today it quit again and has remained off. I'm curious as to whether this is a simple issue with a loose cable or if it has more to do with the onboard computer. If it sounds to be a cable issue, I'd really appreciate a heads up as to where to locate each contact point, so I can attempt to tighten it myself. If not, any ideas would be helpful.