I don't know what a serial console is. That is way above my "paygrade." And to think I was proud of making an AppleScript back in the day that posed an asinine question and restarted your computer no matter what you answered.
The TV's native resolution is 720p, it's a cheap TV in the guest room where I was going to use the Beelink X2. (I've got two glorious Nvidia Shields in the living room and bedroom.) Could it be outputting something in the wrong resolution without changing the front color from the red? I'll hook it up to my monitor tomorrow.
Thank you again for a hasty response.