I currently have a macbook pro 15 inch 2.5 ghz with which I have been utilizing both Windows and OS. The external monitor has always worked on both systems but now that I upgraded to window's 7 it doesn't seem to work anymore. I do remember that when the monitor was ever reconnected I had to go to nvidia control panel and switch it to dual mode. How can I get my monitor to start working again? Any help would be appreciated, thanks. Now I just found out my sound doesn't work either?