I get an error message on the screen with an HDMI connection

Ensure that your HDMI cable is certified.

Press the SOURCE button on the remote control to switch to another source and then
switch back to the HDMI source.

Reset the accessory device and the TV.

Turn on the TV

Select the HDMI channel

Turn on the accessory device

While the TV and the accessory device are powered on, unplug either end of the HDMI
cable and then reinsert the cable.