Rob has a video projector that he uses with his PC and Mac. He can get it to mirror on the Mac, but it stopped working on Windows. Leo says that an update could've broken the connection. Or it could be that the mirroring option was disabled. Rob should try a different resolution and see if that works. 1024x768 is the basic resolution. Sometimes a projector doesn't support the full resolution. Macs work easier while the Windows side is more tedious to get to work.