I recently connected an Optimum Samsung cable box via HDMI to my tv and get picture but absolutely no audio. I have tried every HDMI port and same result. I believed I had a faulty HDMI cable but I have tried 5 cables and same end result with all of them. I have searched everywhere for an answer to this and have been unsuccessful. I have a ps4 prop, apple tv, shield, and pc and all work fine through HDMI picutre/audio flawless.