I have just upgraded to:
Asus K8V-X - with onboard sound disabled.
A64
Radeon graphics
win XP pro
But kept an old PCI128 soundblaster sound card.
Before I upgraded I was runing xp home on a P3 500. And the sound worked normally.
Now the sound only works sometimes after turning the computer on. If I delete drivers in device manager and then restart the computer the sound will work when the drivers install automatically after restarting.