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#11
Don't hold me to it but from the looks of what you're describing it looks like you have a mix of HD Audio and AC'97 connected. This is from the manual for your motherboard,
and shows the proper jumper configuration. The bios setting it is referring to is under the Southbridge configuration setting and only has two options, disabled and auto with auto being the default.
This is from a different manual but shows the difference between the HD Audio and AC'97 connections,
so double check all the connections on yours, or if you don't use the front panel jacks disconnect them all together.