Q: I just bought a MBP and i love it. however the screen keeps fading in and out when its plugged in, whats going on?
A: I'm surprised none of the other experienced Mac users touched on this: the MacBook Pro, as well as its PowerBook G4 predecessors, has an ambient light sensor built in (just under the speaker grilles, if I'm not mistaken). By default, Macs with ambient light sensors are set to vary the brightness of the screen based on how much light it sees around it. The problem with this is that every time something (such as your hand) casts a shadow on that sensor, your Mac thinks it's gone dark and starts screwing around with the brightness! :P You can stop it from doing this by opening up System Preferences (the metallic rectangle with gears in it), and clicking on the "Displays" icon. At the bottom of the window, there's a checkbox labeled "Automatically adjust brightness as ambient light changes". Click on that to uncheck it, and the brightness should stay put until *you* decide to change it. Hope that helps! :)
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