yep, thats gonna be the cable then. you need to use a HDMI cable (both ends) They are pretty cheap and uoui can get them for under a tenner.
Features specific to HDMI, such as remote-control and audio transport, are not available in devices that use legacy DVI-D signalling. However, many devices output HDMI over a DVI connector (e.g., ATI 3000-series and NVIDIA GTX 200-series video cards), and some multimedia displays may accept HDMI (including audio) over a DVI input. In general, exact capabilities vary from product to product.