You were the only one to respond, and offered various remedies I had not checked.
OK, no spider. Check.
Different socket? I thought there was only one - on the side where I plugged in. Then I found two more on the back. I should have known since the input I use is called HDMI3. I plugged into HDMI1 on the back and the picture was perfect. Wow! Thanks again for taking the time to help a total stranger - a true kindness.