I've been through all the phone menu prompts - reboots and tests many times without a result. Finally got through to an an agent on chat; after many more tests and reboots she claims the box is fine, problem has to be the HDMI cable. Not that easy for me to change because TV is wall mounted with hidden cables. Before I even waste money on a new cable, is it even possible that it's the cable when only the picture is affected; all the menus and the info ribbon at the bottom of the screen are perfect?
