I'm using a new DVI-I cable with a DVI-I to HDMI converter to the back of the HDTV monitor's HDMI port. All else looks good on the monitor so I think the cable is ok. I've read something about the NVIDIA card accelerator options may not be set right - don't know where this info is and what it should be set at. Please advise if there is something else to check. Thanks for responding to this supposedly simple but aggravating problem that I'm having. I haven't found anything on the NVIDIA nor Windows site that describes this fundamental looking problem.