It doesn't matter what channel I use. Videos "load" a black screen and nothing happens. The timer shows it is playing, but it's just a dead black screen. "Continue Watching" shows I watched something, but nothing loads or displays.
TCL TV model 43S325
These things are just little special purpose computers. Like their big brothers sometimes clearing things out by restarting them is all it needs.
Restart via Settings > System > System restart (Or for Roku TV: Settings > System > Power > System restart)
If a restart doesn't do it, try pulling the power plug to the device for a minute or so then plugging it back in.