This was a helpful reminder for me. The default driver is only used for BIOS and installation. Windows startup uses the designated driver. Could it be that during the driver installation you need to specify a TV mode? This of course fixes the configuration so that it is problematic to reverse without reinstallation. This is the problem I have with cable now since I temporarily wanted to control a receiver through a remote. Now I have to press two buttons to startup with the receiver off. Update > sorry I lost my notes on this so I believe I mean what you did in setting the TV mode. I did this with a graphics card and the nVidia control panel was particular about setting this correctly as I recall.