Why can't I use my Apple TV with my new 4K TV?

Episode 1497 (58:39)

Murray from New Jersey
Dr HDMI

Murray has an Apple TV 4K and it's not working with his LG TV unless he reboots it. Leo says it's probably an HDMI handshake issue. It could be a bad HDMI cable. Or worse, a bad HDMI port. Apple says to hold the menu/volume buttons down for 5 seconds. The Apple TV will run through resolutions until one wakes it up.

David calls in to recommend getting a Gefen HDMI Detective. MonoPrice has a similar product called Dr HDMI. The HDMI can fall asleep and it has trouble waking up. Dr HDMI will keep his HDMI ports awake.