I just purchased this item so I could play Netflix movies/shows from my laptop to my HDTV monitor: http://www.amazon.com/dp/B003OC6LWM/ref=pe_175190_21431760_cs_sce_dp_1 The video works great. However, it seems that audio is still coming out of my Macbook rather than through the TV- is there another adapter or cable I need to buy? Please excuse my ignorance! Thanks!!