The first thing you should do is check the HDMI port on your TV. Ensure it's clean, free of dust, and not damaged. You can try switching to a different HDMI port to see if that resolves the issue.

Repeat for Other Ports: If necessary, test each HDMI port to determine if one is working while another is not.

So I bought a video card with an HDMI port for the express purpose of hooking that up to a video receiver, and now it doesn't work. The TiVo works fine, and the card is a cheap nVidia 8500 that ...