is it a motherboard with realtek audio drivers? if so, open the panel, click on the middle tab (Audio I/O) at the top. click the little wrench to the right of "analog" for settings, then disable front panel jack detection. i cant remember if there is a confirmation box that pops up or not. that should work if you are usign teh realtek audo drivers.
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CPU || e8400
RAM || 2GB corsair xms2 pc6400 800mhz
HDD || 2x WD Raptor 150GB 2x WD 500GB
MBO || EVGA 680i SE
GPU || Evga 8800GT Superclocked w/ Accelero
PSU || Silverstone 750 watt
Case|| Antec p182
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