Dell S3423DWC User Manual page 52

If you press any button other than the power button, the following messages are
displayed depending on the selected input:
Dell P2418HZ
If an HDMI or USB-C cable is not connected, a dialog box as shown below is
displayed. The monitor will enter Standby Mode after 4 minutes if left at this state.
Dell P2418HZ
Dell P2418HZ
52 │ Operating your monitor
Dell 34 Monitor
?
No HDMI 1 signal from your device.
Press any key on the keyboard or move the mouse to wake it up.
If there is no display, press the monitor button again to select
the correct input source.
Dell 34 Monitor
? No HDMI 1 Cable
The display will go into Standby Mode in 4 minutes.
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Dell 34 Monitor
? No HDMI 2 Cable
The display will go into Standby Mode in 4 minutes.
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or
or
S3423DWC
S3423DWC
S3423DWC