Dell S2421H User Manual page 34

To unlock the button(s).
Press and hold Button 4 for four seconds until a menu appears on the screen. The
following table describes the options to unlock the front-panel control buttons.
Dell 24/27 Monitor
Select Option:
Options
1
Menu Buttons unlock
2
Power Button unlock
3
Menu and Power Buttons
unlock
4
Built-in Diagnostics
34 | Operating the monitor
Dell 24/27 Monitor
Select Option:
Description
Use this option to unlock OSD menu function.
Use this option to unlock power button to turn off
the monitor.
Use this option to unlock OSD menu and power
button to turn off the monitor.
Use this option to run the built-in diagnostics, see
Built-in diagnostics.
Dell 24/27 Monitor
Select Option: