Do you have the latest drivers from nvidia?
I don't understand what you mean when you say dvd to hdmi, i take it you meant dvi to hdmi yes?
I use my laptop for a HTPC in my bedroom, it however has hdmi output port. I'm not sure if a dvi to hdmi adapter would work, as I've tried myself in the past (my laptop also has vga output)
I tried doing vga from laptop, to vga to pci adapter, and then into a dvi port on an old 22" flatscreen that i have laying about. Never worked. At the time I put it down to the adapter, thats all it could of been. Since then i got a 42" bravia, and never had an issue with hdmi to hdmi.
Does the computer detect the TV as a display in device manager, or nvidia control panel?
here is what my settings look like click here
My laptop screen is not shown up as I have its lid closed (disables it). If it were open, then that display would be another selectable choice.