Don't use an HDMI to dvi cable buy a converter box instead , this will give you more output options , VGA or dvi component s video ,rca audio possibly optical too, but they can be expensive
You may have to use http://m.ebay.com/itm/331317182706?nav=SEARCH
And if dvi is regestered on the TV as PC then you may have to use the PC sound input too so you'll need rca/ phono to jack hope this helps you or gives you a few ideas