ANALOG BACK PANEL And FRONT PANEL Does Not Work

i bought this system on 2nd november. just imagine, i spend ~1800$ to buy this pc AND after 17 days, 17 days i still cant get sound out of my onboard sound card!

the problem is that the ANALOG BACK PANEL and FRONT PANEL does not work

Here are gigabyte tech support's answers to my problem:
"We are really sorry for the inconvenience you have with our product and According to your description, a further testing or examination to your system might be required."

today, my supplier tested the motherboard in front of my eyes, and it worked fine THERE.
they said maybe it is your graphics card's driver (HD 4870) that makes this problem. so i came home, uninstalled the VGA driver and ATI HD Audio driver and STILL NO SOUND my speakers are fine (i tested them with another pc and with my mp3 player) and i installed the latest drivers for everything.

i also e-mailed Realtek technical support last week, and they didnt answer!
i asked in 3 or 4 other forums (tomshardware, anandtech, guru3d....) no one could help me
if u need to know anything, please let me know and here are some pictures, maybe they can help u to figure out what is wrong with my pc
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as u can see in the last picture, the ANALOG BACK PANEL is inactive in Realtek HD Audio Manager.