HDMI issues - anyone else having this?

I seem to be encountering a persistent issue whenever I attempt to connect my PC to my TV via an HDMI cable. While the video signal appears perfectly fine, there is absolutely no audio coming through the television speakers. I have already attempted to use a spare cable borrowed from a friend, but the result was identical, which leads me to believe the cable itself is likely functioning as intended.

I have spent quite a bit of time scouring various forums and troubleshooting sites, yet I haven't found a solution that works. It is possible that the system is simply struggling to determine which audio output should take precedence. I believe I have an AMD HDMI output listed along with the sound card settings in the Control Panel, though I am merely speculating at this point, as I really ought to sit down at my desk to verify the exact terminology under the sound settings menu.

Interestingly, when I plug headphones directly into the computer, the audio works without issue; however, once those headphones are disconnected, the sound fails to transition to the TV.

Everything was functioning flawlessly immediately after I purchased the cable, but then, quite out of nowhere, the audio just vanished.

It's not coming from the sound card. That means your analog output is active—basically, it's stuck on headphones. Go into your playback devices and set the Intel HDMI audio as the default instead.