|Try to open up your case and find the front panel audio cable and disconnect it from the motherboard. You will have to find some jumpers because with the AC97 boards your rear audio will not work without the jumpers.|
You will have some pins that look like this :.::: so not where the blank pin is, now you want to put the jumpers over the two sets of pins on each side of the blank pin. It should look like this |.|::
Let me know if this works.