Just built a htpc with a Asus p8z77 and a 3570k. Have an older Denon receiver that has no HDMI, but has TOSLINK and coaxial. Before this I used an old acer prebuilt pc with a g45 chipset and a q6600. I built a S/PDIF adapter plate that connected to the motherboard and it worked well. There were some issues making the thing work but in the end it worked. I came back after vacation and there was no sound. Built another system (the one with the 3570k) and still can't seem to get any audio. Neither TOSLINK nor COAX seem to work. The weirdest thing is that the TOSLINK LED that should shine behind the "door" for the optical cable is dark - both my other PCs have that LED shining constantly when on. Is there some weird windows 10 setting I'm forgetting? Checked BIOS - everything should be working. The TOSLINK LED does not come on when cable is in (cable is dark).