The 45w power adaptor on my 2010 13" Air died after about 16 months of use. It was acting flakey up to the failure, and finally the green or orange light would not come on. Went to apple store and bought a 60w adaptor, and it works fine. I've noticed a lot of failures on these, wonder if Apple is going to have a recall? The way it acted, it appears the capacitor slowly went bad. This could be a design flaw. Shouldn't have to shell out $60-80 for a new power adaptor after a year!