About a year ago my macbook air started having trouble charging, I would plug it in and nothing would happen and then eventually if I unplugged it and replugged it enough times it would normally start charging again. Until it stopped working entirely. So I took it to the apple store and they gave me a new charger. A couple months later,however, I started having the same problem. This time I did a little more investigating, I found that my charger worked perfectly in other peoples macs and even stranger their chargers didn't seem to have any trouble charging mine. Then I had to go back to school and I figured I would just have to deal with it there but when I got to school the problem just went away, I never had any trouble getting it to charge until now. It's been about five months since I last had the problem but recently I haven't seemed to be able to get my charger to work until I unplug it and replug it many times. I'm worried that eventually it will just stop charging altogether like it did the first time. Any idea whats going on here? I'm totally stumped by the whole thing...