Switched on the Horizon out of the box, & get the welcome screen with Welcome in many languages & a picture of the Horizon box, but then screen goes blank.
INSTALLATION is on the front panel of the box, but screen is blank. Wifi is working, as is phone, but nothing on the TV for 2+ hours. Pulled out power, tried again, same result.
Removed ALL cables. & tried again. Worked this time.