Since modern TVs don’t do DVI any more, only HDMI, and you need to combine your (digital!, HDMI does not do analog) audio:
device that combines digital video (DVI) and digital audio into HDMI
Edit: this is the same device as this one: http://cableorganizer.com/quest/hdi-6160.html; Amazon is a LOT cheaper!
–jeroen
via Amazon.com: DVI + Audio (SPDIF & Toslink) to HDMI Converter Adapter: Electronics.