I don't know if I've misunderstood, but your symptoms sound similar to what I used to have.<br>
<br>
It sounds to me like the problem is a VSync issue. If you go to
nvidia-settings and select the VSync to Blank device: TV (rather than
to monitor), I think that should fix it!<br>
<br>
Sorry if it sounds a bit vague - I'm just reformatting now so I can't check the exact wording!<br>
<br>
Jonny<br>