I've got a macbook air and unfortunately it's out of applecare so I can't get help there. Anyway recently it has started to not always charge when it is plugged in, and there is no light on the power cord. However it will sometimes randomly start charging again, it does this in different plugs and different buildings so I know it isn't just a problem with the plug it's put into. My guess is that there is a bad connection somewhere, I'm just not sure if it is in the computer itself or if the charger has just gone bad on me, I'm thinking it's probably the computer since it sometimes just shuts off even if the battery still has charge and it's plugged in. Any ideas, is this a problem with the computer itself, or do I just need to buy a new charging cable?