I recently acquired a Power Mac G4 and Cinema Display from a school auction for dirt cheap. I knew I would have issues but the price was right. Now im not sure if this is a problem with the video card or what. The bar in the middle is like the edge of the screen. The mouse wont pass from the right to left unless you move the mouse off the right of the screen and then it passes to the left like it would if you had a dual monitor set up. I also plugged in an old dell monitor into the other monitor slot and it seems to display just fine. You guys have any ideas? Thanks.