s-video is not HD
it is only better than composite, but not HD
DVI is digital, so it is best
if you pc has dvi out and youy hdtv doesn't have dvi IN just get a connector converter from dvi to hdmi
this is the order of worst to better picture from your tv (monitor)
1. composite (the yellow video connector)
2. s-video
3. component (the 3 color connectors blue/red/green)
(this one could be better than 4, depends on ehre th RGB signal came from)
4. vga
5. hdmi=dvi
grets