Have you encounter the same problem before or is it just happening now? Is it the same on all of your batteries? Have you checked the charger? Check the power cable (wall socket to the charger) and the cable from the charger to the battery for damage. Try another wall socket. No need to "turn on" anything, just plug the charger into the wall socket and connect the battery using the plug at the end, it only fits one way in. Everything should start after a second or two automatically.