I recently bought a Sony Bravia KDL-40XBR9. I have it hooked up to my MacBook using an HDMI to DVI connection. But, I'm not getting sound through the TV. So, I bought a 3.5mm to RCA (one red, one white connection) cable. I've plugged the red and white connections into all of the red/white ports on the back of the tv but I'm still not getting sound out of the tv. How do I get the tv to use the HDMI for video but the RCA for sound? Any help would be greatly appreciated! Thanks!!