Thanks - I think I may have made a mistake upgrading to Windows 7 but now my puter doesn't recognize HDMI and hangs the system when I attach the HDMI cable. Maybe the card is shot but my HP a6655f doesn't show any problems. If I can't resolve the problem I think I will try another card and connect a good set of PC speakers for sound to my big screen. What a beautiful picture with Vista! Do you have any suggestions on what may have happened in Windows 7 or what a good replacement card might be? Both MSI and HP were of no help. Hopefully I am just missing something simple.