I'm waiting for a proper monitor and currently have my Mac Pro hooked up to a 42" 1080i Dell Plasma. Using the Display settings in System Preferences the maximum resolution I can select is 1280x1024. I was expecting to be able to use something closer to 1920x1080. Am I missing something? The computer automatically identified the TV as a Dell 4200HDTV which is correct. Thanks for any insight.