I've been using an external monitor (acer) with my iMac 24" 2.16 ghz core 2 duo, mostly with Logic and various instrument plugins. It's been working great for a few months. Then today all of a sudden the display changed resolution (I think in response to some Logic zoom commands that I think are similar to some finder commands? not sure) Anyway, when I reset the system preferences back to what I think it's usually set at, the largest, which is 1920x1200, it looks a little fuzzy, and the full desktop is not shown on the monitor, I have t scroll to get to the edges. I disconnected the acer external, but it didn't change anything. Anyone know what could have gone wrong and how to fix? Thanks!