Not sure if it's meant to do this or not. It's the new cMBP. The charger where you plug it into the mac. Sometimes the light is on (green/orange) and sometimes it's off. If I move the mag cable it'll light up. Is it just not connecting right to get the light to glow? I dunno. I don't have any issues it charges and runs off AC just fine. It's just the light. My experience however tells me eventually it'll become a problem but then again I'm not familiar with macs. Is it suppose to do that? I'm assuming it is not. The light seems to go off randomly and I cannot reproduce it. I can only reproduce the "fix" which is to simply slide the mag cable up/down.