Seems quite a few people here and at other forums either improperly disconnect their power cable or they've had their MagSafe adapter or cord go bad from imporper disconnection. So heres this: http://docs.info.apple.com/article.html?artnum=306445 As well as this: http://docs.info.apple.com/article.html?artnum=306446 Heres a video as well (where I originally found this) http://www.youtube.com/watch?v=-qGbOC26Wko As you can see in the video, the author's cable is already visibly strained from being improperly unplugged (as he admits to doing) and will most likely die in a blaze of glory anyway. So there you have it. I've always disconnected my MagSafe the "proper" way and was surprised by the sheer amount of people who pull the plug out by the cable and not by the head. Hopefully this will help some.