I have not been able to get any help with this problem and I suddenly thought of this board as I know there are some tech savvy people here. I installed a Nvidia Gforce 6600 video card and now I have no sound. I can uninstall it and the sound is fine so I know its something to do with the video card. I have never had this sort of problem before and am at a loss. There is nothing in the user manual to give a clue. I wents so far as to install another pci soundblaster sound card that I have it it does not work either.I have not been able to find a support site for the supplier. Does anybody have a clue what the problem might be or a site that may help me? This is a pci express card.