Icho

I recently built a new pc and bought the Asus Essence STX II, and it says it need power from the power supply to run. I found where I plug in the cable to the sound card, and it says it need a 4 pin molex connector. I looked everywhere online for one but I can't find one that goes from the power supply to the sound card. I have a cable that looks like it'll fit in place perfectly but when I try to push it in it won't fit.