Can someone please give me an idea of what could be wrong with my MBP or charger. From a day or two ago it's very selective of what power outlet it will charge from, and even then it may just stop charging. eg It could be plugged in and then take about 5 minutes to the charging light to come on then turn off again after 20 minutes and it will stop charging. But then I just tried a different power socket and it was charging fine. And then theres some that won't work at all. It's not the power sockets that are faulty because other things get power, just not my computer. It also seems to happen under OS X, W7, or even when its turned off or sleeping. Thanks.