So I have a Dell u2711 hooked up via DVI from my 2010 Mac Pro. I wanted to add a second screen so I got a MPD -> displayport adapter so that I could hook up my Dell via displayport and my crap monitor to DVI. Problem is, as soon as I plug in the MDP adapter the screen goes to the "stars" desktop and I can't see or do anything. What the hell am I missing?