I recently purchased a new 24" Samsung 245B display. I have it connected to my MBP via DVI and it's absolutely gorgeous. The matte screen of the B (v. the glossy display of the BW) is perfect, and after fiddling around with the calibration the colors are perfect. What I can't figure out how to do is turn off the MBP display when the external is connected. It's not that it's a huge problem. I have my MBP on a Griffin Elevator and when watching video or there's lots of screen motion, I find I'm distracted by the mirroring. I don't like the extended desktop, especially since the dock only appears on the MBP. I'd prefer to just turn it off. I have Vista installed via BootCamp and I was able to turn off the MBP display by selecting the Samsung as the primary display device. Is there any way to do this in OS X? I've looked for a setting, but am at a loss. Maybe a piece of software that I need? Thanks for any help.