Dell Users Guide
Page 47
If you press any button other than the power button, one of the following message appears: Activate the computer and wake up the monitor to gain access to the OSD. When the monitor enters the Power Save mode, the following messages will appear depending on the selected input: HDMI (MHL)/Mini DisplayPort/DP input or 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 Operating the Monitor | 47
If you press any button other than the power button, one of the following message appears: Activate the computer and wake up the monitor to gain access to the OSD. When the monitor enters the Power Save mode, the following messages will appear depending on the selected input: HDMI (MHL)/Mini DisplayPort/DP input or 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 Operating the Monitor | 47