hi dangerduckie,
i've checked your motherboard and it has the AC97 built-in sound card.
have you tried downloading and installing realtek ALC650 drivers for xp
goto;
http://www.realtek.com.tw/downloads...8&Software=True
and select the "Windows 98Gold/98se/Me/2000/XP/2003 for Driver only. " download and then install.
i gave this a go to fix my problem but it did not work for me. i think i've fried my sound card!!
it may work for you however.