Dell UltraSharp 32" 6K HDR Video Conferencing Monitor - Manual (Page 92)

92 | Operating the monitor
If either Thunderbolt (140W) / mDP / HDMI input is selected and the corresponding
cable is not connected, a floating dialog box as shown below appears.
No mDP Cable
The display will go into Standby Mode in 4 minutes.
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or
No Thunderbolt(140W) Cable
The display will go into Standby Mode in 4 minutes.
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or
No HDMI Cable
The display will go into Standby Mode in 4 minutes.
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When the USB upstream cable is not connected, and you press the Hookswitch/
Mute button, the following message will appear:
This function is inactive .
To enable, connect your PC to the USB upstream port on the monitor.
NOTE: For the Hookswitch/ Volume down/ Volume up/ Mute buttons to
work, you need to connect the USB upstream cable (Type-A to Type-C or
Thunderbolt
TM 4) from the PC to the monitor.
See Troubleshooting for more information.