Dell U2415 User Manual page 49

Activate the computer and wake up the monitor to gain access to the OSD.
If you press any button other than the power button, one of the following messages will
appear depending on the selected input:
HDMI (MHL)/Mini DisplayPort/DP input
HDMI (MHL) input
If either HDMI (MHL), Mini DisplayPort, or DP input is selected and the corresponding
cable is not connected, a floating dialog box as shown below appears.
or
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Operating the Monitor |