In most cases, if this error persists, you may have faulty or outdated NVIDIA drivers installed. How to Fix HDMI No Sound after Connecting Computer to Monitor and TV. If you bump into HDMI no sound issues, you can check this article: If this simple method solved your connection problems, then congratulations! But if not, don’t worry, you can go ahead to the next fix. Your device should not be grayed out anymore.
Under the Playback tab, right-click the blank area and check Show Disabled Devices and Show Disconnected Devices. Make sure you’ve selected your connected device for HDMI. 
Right-click your desktop and select NVIDIA Control Panel. First, you need to check if you’ve set the NVIDIA output correctly. If you can’t enable sound for HDMI output. Use the generic high definition audio device driver. But most important of all, you can fix it quickly and easily. Many Windows users are reporting exactly the same issue. Your NVIDIA outputs are grayed out and listed as Not plugged in? Fail to enable your HDMI sound? Don’t panic.
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