Dell UltraSharp U2421HE User Manual page 51

When the monitor enters the Power Save mode, the following message will appear:
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 either DP, USB Type-C input is selected and the corresponding cable is not connected, a
floating dialog box as shown below appears.
Dell UltraSharp 24/27 Monitor
Entering Power Save Mode.
Dell UltraSharp 24/27 Monitor
No DP signal from your device.
Press any key on the keyboard or move the mouse or wake it up.
If there is no display, press the monitor button again to select the correct
input source.
Dell UltraSharp 24/27 Monitor
No DP Cable
The display will go into Power Save Mode in 4 minutes.
www.dell.com/support/U2421HE
www.dell.com/support/U2721DE
Dell UltraSharp 24/27 Monitor
No USB Type-C Cable
The display will go into Power Save Mode in 4 minutes.
www.dell.com/support/U2421HE
www.dell.com/support/U2721DE
U2421HE/U2721DE
U2421HE/U2721DE
U2421HE/U2721DE
or
U2421HE/U2721DE
Operating the Monitor | 51