Dell UltraSharp 34 Curved Monitor - Manual (Page 55)

Operating the Monitor | 55
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