Unable to get Gen 3 to display on TV. Works fine on two other tv's. Tried all normal troubleshooting, reset, new HDMI, etc

It's HDMI 1.3:

http://www.crutchfield.com/S-91bbWPQ7hyV/p_13342PZ700/Panasonic-TH-42PZ700U.html

The fact that the Direct TV unit works does not rule out a TV defect since it is using 1080i not 1080p which the ATV uses.

The fact that the TV did display the ATV and then lost it also suggests a defective TV unless that coffee you went for ended up getting spilled on the ATV.

Your tests prove the ATV works fine on other TV's and if you can set them at 1080p 60Hz on those TV's without issue, this rules out the ATV.

The fact you don't see any response from the screen when booting the ATV and changing settings again points to the TV. You should see something if the signal is changing.

Like all bad news in life the toughest part is to accept it. I think we have to accept your tv is bad and move on to other things...

I Have similar problem. I have Panasonic plasma with Directv on hdmi 1 and Apple TV on hdmi 2. I had a 3rd generation Apple TV that worked fine. I replaced it with the 4th generation and when I switch to hdmi 2 to access the Apple TV it switches back to hdmi 1 and Directv . I took the 4th generation atv and connected t to a samsung and it works fine. Any explanation?