I have a Sony PS2 which is connected to my graphics card (7800gtx). This works and i can see the game on my computer however there is no sound. Probably because the red and white cable was not connected to anything. I have bought a y adapter so the cables - red and white connect to the y adapter and then i have connected the adapter to the headphone socket of my surround sound system but still no sound - what connection do i connect this to? PLease help i wanna hear sound when i play my need for speed underground 2