Front panel mike not working

Hi Guys.
I have an intel 965 motherboard.
My front panel microphone is not working.
I am using sigmatel audio driver.
The back panel 5.1 surround sound jacks are working fine. I am able to configure the rear panel audio jacks to connect a mike and it works fine.
The front panel headphone and mike ports are connected to the motherboard just fine and i have checked it many times. The front panel headphones are working normally.
Is there any jumper setting that I shuld check?
Has anyone a solution to this problem.
Satish