Gigabyte K8N Ultra-9 - only front seakers works

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I've got Gigabyte K8N Ultra-9 with Athlon 64 3000+. On Windows XP SP2
only only front seakers output works. During booting some small noise
is heard from subwoofer, so connectors on the motherboard must be OK.
I've tried upgrading bios, Realtek AC'97 and nForce 4 drivers. Nothing
has changed.

I suppose the problem is caused by AC'97 and sound in nForce4
coexisting, but don't know how to make it working.

Does anyone have some idea?

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