Dell Dimension 8400 Audio Failure

Overnight my audio went from functioning perfectly to "No Audio Device" "No Playback Devices" "No Recording Devices"

Hardware Tab for the SoundMAX Digital Integrated Audio shows "This device is working properly." All other sound related items ssay the same thing. Checked all plugs and cords, checked to make sure there were no Mute buttons on, still no sound.

Since its an integrated sound card, how do I replace it or get it working again? (I'd rather not hear, "Replace the mother board." )

Thank you for any help/suggestions.