I experienced the ever so popular black x in the middle of my battery screen like many others. Which it will not charge and can only run off the ac adapter. I have tied the new battery bundle 1.2 and doing a SMC ( system management controller) none worked. SO i went to the apple stored explained the problem to the tech guy who then gave me a brand new battery and seemed to work at the store so i went home plugged my computer in and i still have the black X . I have no idea how to get rid of the thing. it shows on my ac cord the light in the red orange color which means its charging still. So I need some help. Anyone else have the same problem or know how to fix this?