I had a problem with green light in my power adapter going out twice actually. I think it is called a magsafe adapter. A month ago this happened I had to go to our closet Apple store and they gave me a new magsafe adapter. I have a Macbook Pro newest one 10.6.6 which I just bought in Nov, 2010. The magsafe part of the plug that connects into the laptop has tiny prongs in it and I remember the guy gave me a cap to put on it when not in use with the replaced power adapter. I am guessing he gave me the cap to keep dust or particles out of the prongs on the magsafe. Well a month later, tonight in fact the green indicator light went off again and with it plugged in and I was losing power again. I did not want to have to go again to Cleveland tomorrow as its bad weather here in Ohio and its it 1-1/2 hours away I decided to try a toothbrush to clean out the prongs . Yeah I was amazed to see the green light go back on. Its now from 52% to 64% so my laptop is again charging. Yeah! But honestly I think they should give us a cap and a tiny brush with instructions when we buy these systems. The guy told me they stopped including the caps a few months ago. These systems are not cheap!!!