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My MacBook Pro (2012, Retina) will suddenly not charge when it's turned on.
If I shut it down, it charges normally (orange led, goes green when full).
After I turn it on it keeps the green led on until OSX starts up, then the light goes off.
I haven't seen anything suspicious in the console. I also did a PRAM/SMC reset.
OSX 10.8.3
I had the same problem and have tried everything, with no result. Suddenly, I reset the SMC without turning off the MacBook Pro, i.e. with the MBP on and the charger plugged, I hit Shift+Ctrl+Alt+ON for ten seconds (the MBP switches off instantaneously). After restarting, the mac was charging properly.
I went to Apple Support and even though it looked like a software issue, they just exchanged the power supply and now it's working perfectly again.
