Now, plug out their power supply and press and hold the power button for 3-5 seconds.Shut down each of your devices completely by powering them down completely.Power cycling would force both devices to reset their configurations and in most cases, solve the problem. There are numerous instances where either of the device involved could be in an error configuration which might be glitching the HDMI sound. If none of the methods work, then we can attempt at power cycling our devices. Now make sure you let us know which method worked for you in the comment section below. Note: You may have to do some or all of the above steps to get sound coming out of your TV when connected using a DisplayPort-to-HDMI cable to your MacBook Pro. Select the HDMI device on the left panel, and change the “ Format” values to 00Hz.
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