Computer Says "no Devices Found" For Sound

Jun 7, 2012

We just built a computer yesterday and as we plugged in the speakers on the 7.1 audio on the motherboard, there was no sound! we checked control panel>hardware and sound>sound> and it says "no devices found". we downloaded sound drivers from "realtek", installed it, restarted, still a no go! but as we plugged in the usb headset, voila, there was sound! what we dont understand is why wont the 7.1 audio channel work on the motherboard?

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