Apple TV 4K stopped working

I have been using my Apple TV 4K for about two years with only the occasional need to unplug and let the system do whatever it needs to get going again.

Today we were watching and the tv screen went black, and the LED was out on the ATV box.

I checked the internet connection and everything else is working fine.

I unplugged the unit and charged the Siri remote.

I then checked the HDMI cables and the tv cables.

Everything but ATV is working.

The unit is dead and will not come back on.

Any suggestions?

Thanks.