Dell SE1918HV User Manual page 48

You will see the following message before the DDC/CI function is disabled.
When the monitor enters the Power Save mode, the following message appears:
Activate the computer and wake up the monitor to gain access to the OSD.
If you press any button other than the power button, the following messages will
appear depending on the selected input:
If VGA cable is not connected, a floating dialog box as shown below appears. The
monitor will enter Power Save Mode after 5 minutes if left at this state.
48 │ Operating the Monitor