This happened just an hour back. My macbook suddenly decided it wouldn't charge. The battery icon says "Battery Not Charging", "Power Source: Power Adapter". However, the strange part is that the macbook charges fine with my macbook pro adapter. And, the macbook's adapter charges the macbook pro fine! BUT, the original combination isn't working. FWIW, I have restarted a few times, removed and reinstalled the battery, reset the NVRAM/PRAM and even the SMC. No go. Any idea why this is happening? Seems very strange to me.