Arestavo, thank you for your help.
TV is set to the correct HDMI Input (has previously worked on this HDMI input for past year as second monitor with radeon card), and I've tried different cables, and different HDMI ports on the Sony TV.
I tried your suggestion of TV only, had been planning to try that myself, and got flickering picture with lots of speckled dots throughout the screen. Was able to pull up NVIDIA Control Panel and attempted to make some changes, but the constant flickering on and off eventually freaked me out, leaving me scared for my $1200 TV, so I shut down. Back to the drawing board.
If I can't figure this out I'll have to go back to a radeon card, and I really don't want to do that. Again, thanks for the help though.