When I connect a monitor or TV to my Mac. Usually I have an overscan slider in the Display Preferences. However sometimes, it's not there. Ironically, this always seems to happen when the screen needs overscan adjustment.
Thankfully it's not impossible to fix the issue.
I haven't found much useful information on this, the difficulty level is quite high, we will need to use the terminal. Open spotlight and type Terminal
, press enter and you'll get an imposing Terminal window, with a flashing cursor and not much else. We'll come back to that in a moment or two.