There is supposed to be an 'Arrangements' tab in the Displays sysprefpane. It did not appear when the monitor was connected, and in addition, when the 'option' key is pressed a 'Detect Displays' button appears in the lower right hand corner of the window. However, this appears to detect nothing at all. At this moment in time I have already requested a refund and shipped the monitor back. I have spent a good deal of time trying to troubleshoot this on my own and decided against keeping the monitor even though it looked pretty sexy on the monitor arm that is now bare. )': Please feel free to ask me questions.