Hd 4670 worked for quite a whuile, then started failing to connect/display duplicate screen on TV thru HDMI. I changed to a 5750 and had simular problem. Startup failed to display on TV.. I would find CCC setting changed from duplicat to extended. Chage back to duplicat and it would work, then next time I started up I would find setting switched back to extended. AMD no help so far. I am considering nVidia card maybe GTS 250, but not sure about dual dispay on these cards. Any help? Charles
Sounds more like your settings are not being saved in Catalyst Control Center. This usually means some part of the installation was corrupted. I'd probably try a complete removal of the graphic card drivers AND all ATI software (use Driver Cleaner or some such program). Then do a complete re-install.