hi, im wondering if this cable http://www.monoprice.com/products/p...=10428&cs_id=1042802&p_id=5311&seq=1&format=2 will allow video and audio if i plug my macbook pro 15" i7 into a tv using just an hdmi connected through that adapter...will i have to buy another cable for the sound? ive seen people confirm that there are cables like this one that support audio and video but i was hoping this one did the same thing...anyone try it?