TomTom Rider 2 won't turn on
Hello...my first post on here so hopefully I'm in the right place. I have just purchased a second hand BMW which came with a Tom Tom Rider 2 sat nav plus docking kit on handlebars. I turned it on a few days ago and it worked fine but battery was low. I also put it on the bike and that worked too..albeit tested for around 30 minutes only. Unfortunately, today, it will not turn on...either on its own or on the bike. Any ideas as to why this would suddenly stop working? I have noticed that it has a micro usb port plus a round pin connector....which one is used for charging? The sat nav did not come with a charger of any sort. Any advice would be greatly appreciated as I am not used to this product. Regards.