I was watchin a movie on my laptop and then suddenly the power went off i looked at the cord and the led was out so i think since i plugged it into the wall i was running on batterys power and when i tried disconnecting it and connecting it. but it wont turn on. before i plug it into the laptop the led on the charger works perfectly and when i plug it into the laptop the led comes of on the charger. and the laptop still wont charge. What seems to be the problem.