I've got a friend with a 15" Macbook Pro he's had for about a year, and he just picked up one of the 24" cinema displays. When he closes the Macbook and switches to solely using the monitor, the computer won't run video applications (like Netflix for example). I guess the video doesn't show up at all or lags to a great degree. It DOES work if he uses the monitor as an extended desktop. My guess is that somehow the GPU is powering down when the Macbook is closed. Anybody know how to fix this?
I'm trying to provide help over the phone and haven't had a chance to look at it myself. My google-fu is failing me on this one, so I figured I'd throw the question out to you guys in hopes of getting a quick answer.