Hi,ive built a htcp and its got windows 7 build 7077 on it,Its a AMD Dual Core 5200 and ive got a nvidia 9400gt graphics card which i connected sp/dif cable between motherboard and video card for sound. I get the sound coming through with the picture to my tv but then after a couple restarts the audio device from the video card disappears and its only left with the on board audio. How do i get the computer to load the audio device i want it to use (through the 9400gt hdmi point) along with the picture everytime i start computer?