This problem can literally drive some people insane! So my MB (2.0Ghz CD, 1GB ram) has this electric noise around 'S' and 'W' buttons; this is not from the fan; the noise is like when you put electric motor next to the radio antenna and the interference that you hear from the radio is what it sounds like. It is not very loud but it will drive you insane over time. Therefore, for the last seven months I've been using a small app called "Quiet MBP" to increase the CPU cycles which basically changes the frequency so that it gets more tolerable. This is the same noise people attempt to kill by launching PhotoBooth. Sound wasn't present out of the box, it appeared after a couple of weeks of usage. It also doesn't exist if you boot using the setup CD to use the utilities. And the laptop is dead quiet under Windows XP or Ubuntu. This is a software problem (something within OS X). However, does every MB has it? Is there a way to eliminate it? Please share your experience/solutions to this problem!