I've run into a problem in building my first PC. I'm building a new system with an Intel D975XBX motherboard and despite checking the specs for the motherboard, thoroughly I thought, I now find that it has no connector for connecting audio from a CD_ROM. How do I get sound from my CDs/DVDs? Do I need a sound card and, if so, will the sound card interfer with the 8-channel subsystem on the motherboard?