I have a 17" Macbook Pro bought in late 2009. My TV is a Vizio Plasma bought in 06 or 07. I have the video working with an HDMI cord. After finding out that audio doesn't work through the HDMI cord (Macbook mid-2010 and after have it), I bought a Toslink-to-Optical mini plug digital cable. I have everything plugged in but audio still doesn't work. I go to Sound System Preferences and in Output it say "this device doesn't recognize audio output" or something like that. Does that mean my TV doesn't support that type of cord? Or am I doing something else wrong? Do I need to get a headphone to RCA cord instead?