Hey all, I have a 13" 2009 Macbook Pro. I also have a replacement magsafe. Since mountain lion came out, when I am charging my macbook pro, it will just shut down with no explanation. Sometimes fully, sometimes the way it does when it runs out of battery, where it comes back up to where I left off. Now it just shut down 2 minutes ago and I have no battery info. None. There is an x in the middle of my my battery indicator and the side indicator won't show anything either. Does anyone know where the problem might lie? With the magsafe? Mountain Lion? I ordered a macbook air, but it won't be here til friday and I need this macbook for work. Any help would be much appreciated. Thanks. I will check this thread as often as possible if anyone needs to ask for more info. Edit: I reset my SMC and that seems to have temporarily resolved the problem, but is there any way to prevent the issue from happening?