Error message on the screen with HDMI connection?

Ensure that your HDMI cable is certified.

Press 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.