Dell UltraSharp U2421HE User Manual page 37

Options
4
Built-in Diagnostics
3. Hold for 4 seconds, Select the following table describes the unlock icons:
Options
1
Menu Buttons lock
2
Power button lock
3
Menu and Power buttons lock
Description
Use this icon to run the built-in diagnostics, see
Diagnostics.
Description
Use this icon to unlock OSD menu function.
Use this icon to unlock power button from powering
off.
Use this icon to unlock OSD menu and power button
from powering off.
Operating the Monitor
Built-in
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