Just a possibility that you have two problems...

  Diemmess 17:38 28 Apr 2007

If your yellow question mark 'unknown device', is not in the same section as sound....etc, it just might be relating to a disused dial-up modem, either integrated or as a PCI card.

If it is integrated but not connected, you will either have install from the mobo's disk or ignore the ?-mark.

That still leaves you with a sound problem which has to be a configuration problem and will seem so simple once it is solved!!

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