when I first bought it I just plugged it into the adapter, but soon I realized that if I unplugged the adapter, then the computer would shut down automatically. this never happened when I bought my iBook G4! the battery icon says that the battery isn't charging, so the light on the adapter is green, but there are zero green dots when you press on the button on the battery. when I turn it off, the battery won't charge either. should I take it in, or did I do something wrong?