Why does my 27" LED Cinema Display only display maximum resolution of 1920x1200, when my Mid 2009 13" MBP says it supports up to 2560x1600?

When I have my MBP connected to my 27" LED Cinema Display, my display settings only show a maximum resolution of 1920x1200, when the specs on both my MBP and Display say they they support up to 2560x1600? Am I missing something?

I finally decided to just take my MBP down to the Apple store and see what would happen if I connected it to one of their new ACDs. At 1st, the guy at the Genius Bar told me that my MBP only supported 1280x800 as a maximum resolution. I told him that was for my MBP screen, and not an external monitor. Finally I convinced him to let me connect my MBP to one of their monitors. Low and behold, looking at the Display settings pane I saw some addtional resolutions, including 2560x1600!
So, now I have confirmed that my MBP can drive an external monitor to a resolution of 2560x1600, using just the single mini displayport connection. I just have to figure out what's wrong with my ACD. Suspecting that my older ACD might not support this higher resolution, I did finally discover that my model only supports a maximum resolution of 1920x1600.
Sorry for all the confusion...

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