Hi, so I bought a 5.1 system, came home connected everything, and when I was about to plug it to the pc, boom, my motherboard doesn't have the 5.1 support. So I found a very old PCI sound card, hooked it up installed it, but the speakers do not sound. The mixer says it is sounding, but it's a lie. So I'm planning in buying one USB external sound card or another PCI card. Which one is better? Thank you very much.