My sound setup is an Auzen x-plosion 7.1 card and Logitech Z5500 speakers. All was well until I reformatted my PC. Now, I can't get sound using the optical cord. I can get sound using the direct 3 plug cord (front/rear/sub), so the card and speakers are working. Any idea why the optical is not working? I have tried replacing the cord. I have uninstalled and reinstalled the drivers multiple times and switched PCI slots. Everything but the optical works. Any help would be appreciated!