Hey I'm trying to transfer audio from my mac to my TV. In order to do this I bought a "RCA adapter stero" (That is, a 3.5mm mini jack plug to a black- and a red plug). I connect my mac to my TV by plugging the 3.5mm mini jack plug to my mac and plugging the red plugging the red plug of the cable to the red jack on my TV and the black plug of the cable to the white jack on the TV. But no sound comes through. Am I missing something?