Sorry if I'm posting wrong, but it was the only way I found to try to solve the problem.
Recently (about 2 days ago) tried updating the BIOS to see if I'd find any option to enable SPDIF, but still with the same option (for peripherals) to Enable / Disable the onboard audio or frontal audio
I realized that installing audio driver in Windows seven, the SPDIF option disappears
According to the motherboard manual configuration pins are right, and I could not identify if there is a jumper to connect
About a guarantee for a product of the year 2007 (according to the manual online), think no more warranty