MacBook doesn't connect to TV
I've just upgraded from Mojave to Monterey on my 2016 MacBook Pro. Before upgrade it connected with my TV via HDMI and now it won't. Going to displays with system preferences shows the TV as a connected display option and mirror on but nothing on the TV. I've tried altering display options without success. When I plug the hdmi cable into the MacBook the display on its screen goes really small.
MacBook Pro 13″, macOS 12.2