That plug is not for front audio. It is for a case PC Speaker. You know, one of those little things that beeps like crazy if you didn't plug in the video card right or something
There dont appear to be any pinouts on that mobo for front audio. At least I'm not seeing them in any of the pics. It would be 2 rows of pins and you would plug them in like this: <A HREF="http://www.folken.net/front.htm" target="_new">Headphone/Mic</A>
If there are pins for that on your mobo make sure there are jumpers across the "BL-OUT-L, L-OUT-L" and "BL-OUT-R, L-OUT-R" pins. You need those or the front audio connected to get audio out the back plugs.
Hey, that board is so low-end it actually makes the onboard audio look like the best part! Most boards that old don't have a header for front panel audio.
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