Hi guys, Another problem with my new Macbook Air. This is my 3rd replacement from Apple. The computer is working perfectly fine. However, I've been charging the macbook for a few hours, having moved the computer and accidentally knocked the magsafe plug off, I then re-plugged the magsafe adaptor however it would not charge, no light appeared and when clicking on the battery icon, it showed that is was running off the battery source. I proceeded to remove the magsafe and plug it in again but no luck. I then un-plugged the mains 3-pin adaptor and switched it back on again for the charger to start working again. But again, I un-plugged the magsafe the problem re-occured. What could be causing this as I have not had this before on any of my MacBooks??