I have an AMD Sempron computer. In the front there are two ports and two holes for plugs - one pink and one green. In the back of the hard drive tower there are plugs-holes that are pink and green. My headphone[AX] has a microphone and two wires,one pink and one green. I have misplaced the manual.I need to hear the audio for my video clips Do I use the pink and green or just one color? When the video was played on another computer, it was loud and clear.This leads me to believe I am doing something wrong.I have checked and all the volumes for the computer are as high as they will go. I need to hear the audio with or without the headphones;and right now I would appreciate it if someone who is familiar with a computer like mine would offer some suggestions.Thanks.