Your motherboard has two coax inputs, one is optical coax and one is digital coax, make sure its in the correct input, You may have a bad audio cable, bring up your audio mixer and goto options then properties, make sure you dont have a coax/digital audio options, if you do select it then hit ok, make sure its not muted in the mixer, these are general settings but make fix a big problem for you..
Also, does your cable box have an option to chose which audio output to select?
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