Underscan or Overscan I have been using this monitor (HP24es) since and never had issues. Today, while the monitor was connected and working fine, my MacBook went into sleep mode and when I turned on, this appeared.



I have tried the following solutions


Rebooting Computer with Safe mode and without safe mode
Editing /var/db/.com.apple.iokit.graphics file (no option for pscn or oscn)


What's wrong here?
MacBook Pro 2016 running High Sierra
For anyone who lands here after some time, a simple factory reset of my monitor fixed it.