My power brick whines when i plug it into my MB (which doesnt have a whine btw). Not sure whats going on here, but it stops as soon as i unplug it from my laptop. I tried searching around in the forums but couldnt find any similar threads. Anyone else having this problem? Its starting to become annoying, especially as i'm studying for finals. Should i just take the power brick back to the School apple store where i bought my MB and see if they can replace it?