My Macbook 13" 2 GHz Duo just started getting strange issues with it's magsafe. Basically, when plugged in, the magsafe stays on the green 'fully-charged' light, and does not supply any power to the macbook or it's battery, even though it has little/no charge. Plugging in the magsafe causes the mac to wake from it's low-power induced sleep, though it goes back to sleep almost instantly due to low battery (as though the magsafe was not plugged in). I'm fairly sure it's the magsafe, because I borrowed the one from a friend's MacBook Pro, and it works fine. I've googled for magsafe/battery problems, but I can't find any similar to mine. Any ideas? Should I give up on that charger and just get a new one? Apple should cover it, I think still under warranty... Thanks.