This is a horrible issue that just popped up. It was not present for the first several weeks of using the new MacBook aluminum. Now, if I unplug the AC adapter the Mac still thinks it is plugged in. It says "power source: power adapter" and it does not indicate that it is running on the battery. Furthermore, my power adapter green/orange lights up intermittently now...sometimes it is just black. I am very worried this is a hardware issue with the macbook itself as even when it is running completely unplugged from the ac, it still thinks it is on ac power. I have tried: Resetting the SMC Repairing permissions, repairing the disk in disk utility. Praying to god. Does anyone have any other ideas? Thanks very much.