Dell C8621QT User Manual page 49

If you press any button other than the power button, the following messages will appear
depending on the selected input:
If either HDMI 1, HDMI 2, HDMI 3, HDMI 4, DP or USB Type-C input is selected and the
corresponding cable is not connected, a floating dialog box as shown below appears.
Dell 86 Monitor
No HDMI 1 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 86 Monitor
No HDMI 1 Cable
The display will go into Power Save Mode in 4 minutes.
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Dell 86 Monitor
No HDMI 2 Cable
The display will go into Power Save Mode in 4 minutes.
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Dell 86 Monitor
No HDMI 3 Cable
The display will go into Power Save Mode in 4 minutes.
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or
or
Operating the Display
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