Dell P2418HTE User Manual page 45

If you press any button other than the power button, the following messages will appear
depending on the selected input:
Select OSD items of On in Standby Mode in Personalize feature, the following message
will appear:
If adjust the Brightness level above the default level over 75%, the following message will
appear:
If either DP, VGA, HDMI input is selected and the corresponding cable is not connected,
a floating dialog box as shown below appears.
or
Operating the Monitor | 45