First time posting: I'm having a problem with getting my samsung syncmaster 2233 to work at its native resolution (1680 x 1050) with my late 2009 macbook pro. It seems to work with all lower resolutions (though the picture is not right, it at least stays on) but when I select the appropriate one my external monitor goes black and flickers on and off every so often. After looking at other posts on different sites it seems that there was a fix in energy savings to switch the graphics from "better battery" to "high performance" but I cant seem to be able to find these settings. I just updated my software to 10.6.4, so these settings may not be available in the latest software release? If someone has a solution for this problem please help, its extremely frustrating not being able to use my monitor with my computer.