I know this happened before in the old Macbook Pros by the look of things when I searched around. Basically there is a noticeable high pitched whine when the screen brightness is either not completely off or max. Some people reported they fixed it using http://support.apple.com/kb/TS1442 But since the new Macbooks have the 9400M, is there a similar fix? Any of you have this problem too in XP? What about Vista?