possibly caused by the sound card being of the same chipset but seems far more reliable in vista and win7 with multiple cards
I doubt the sound chip was the same, the one on board was I think a c-media, the sound card was and still is a turtle beach, £400 worth of sound card, mind it was a while back and it was a ISA card, still in use now.
but coming up to date, another acquaintance also had the same problem, the sound built in is a realtek, but the sound card is a M-audio, nothing like each other and yet we had all sorts of problems with that, even turning the thing off in the bios still caused problems. It took aged to get the thing working, so much for plug and play.
you are right vista and windows 7 do work better with multiple cards, put windows 7 on the computer and it worked ok then.
I still think the motherboard have a problem, but it works ok for everything else.
I want to get a M-audio sound card.
Adrian
Desktop machine now powered by windows 7 pro 64 bit, laptop by ubuntu
BTBroadbandanywhere type package, when it works.