I got my MDP-DVI cord today and tried it out. It works fine. I noticed when I had my Mid-2010 13" MBP connected to the external monitor that instead of a spinning beachball, it was the spinning gear that was showing up. When I say spinning gear, its the spinning thing that is below the apple logo at startup. Now that I have disconnected from the external monitor, my cursor will still turn into the spinning gear instead of the beachball. Does anyone know why this has happened?