Make sure both ends of the optical cable are seated right, there are many bad optical cables included with devices nowadays. An optical cable can go bad its glass it can be cracked if bent too far. When an optical cable is all black it very hard to see the orientation of the tip, and since the optical cable only goes in one way. Having a cable with contrasting color along with black helps a great deal in sitting the cable right. It works like batter's eye.
Amazon.com: BlueRigger Digital Optical Audio Toslink Cable (35FT, Fiber Optic Cord, in-Wall CL3 Rate...
Edmund
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