I have the newest imac ( aluminum with mini display port) and i recently bought a apple cinema display 24 . When i hooked it up nothing happened the screen remains black and it does not detect it in my Graphics/Display. The status for the port is "Display Connector: Status: No Display Connected" The sound works on it via the usb cord and when i connect or disconnect the mini display cord or power from the ACD the imac screen goes blue briefly as its most likely auto detecting display. My thoughts are maybe i need to download a update for the 9400m video card or somthing I have updated my imac to the most current firmware and i just cant figure our what would be wrong... Any suggestions? Please respond asap .