It's still quite new. I got it in November. I gave it it's first full charge and it worked fine. The battery died once and since then it won't charge. I plug it in, the green light comes on, I can use the MacBook, but the battery won't charge. As soon as the charger is disconnected, the MacBook shuts off immediately. What happened? I've tried multiple different outlets. Ones in my house, one in my friend's house, and right now I have it plugged in at Panera and it still isn't charging. Any ideas?