When I bought my Xbox, it came with two sets of cables, one had red, yellow and white plugs and the other had red, green and blue plugs. Which one do I use? My Xbox is an old Premium, 20GB and for a while I used the red, yellow and white plugs - these gave me sound and low-def gameplay but I recently had enough of not being able to see things as clearly and tried to switch to the red, green and blue plugs, which I assumed would give me HD gameplay and proper sound. They did not, I was given HD and no sound. Now when I try to go back to the plugs I used before, they don't work. I know that its not the cables, because I bought another set and I've tried both sets on a different TV. What plugs do I use to get HD and sound? Is my Xbox the problem...?