So my friend built my computer last june and it has worked fine till now. Just today I got on and I realized my sound was not working, I tried everything. I tried all my headsets and speakers but none of them worked. when I go to manage devices it says that nothing is plugged in, but I assure you that it is. I tried to restore my computer about 3 times but it still wont work, and when I go to device manager there is this device called "Digital Audio (S/PDIF)" That I have never seen before and it says that, that device is working but I still dont hear any sound. If anyone has any Idea whats going on please help me, Im using windows 7 home premium.