hmm, reset your BIOS, if you have an onboard sound card it may have some how disabled. If its a dedicated card do a "New Hardware" search and see if it picks it up, also try moving it to a different PCI slot.
Also, if it is Onboard try and get ahold of a sound CARD, install it and see what happens
EDIT: Oh!, and welcome to the forums hope you like it here
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