If no lights come on you probably have a bad charger. First of all, does it have afuse in it? If so check to see if the fuse is blown. If not try it on different batteries to see if it works on them. Lastly, completely unplug the charger from the wall (power source) and then plug it back in and try again. If you still have nothing then your charger has probably died. Hate to be the bearer of bad news, but it does happen.

Ken