Dell UltraSharp 42.51" 4K Monitor - Manual (Page 70)

70 | Operating the monitor
OSD warning messages
When the monitor does not support a particular resolution mode, you can see the
following message:
The current input timing is not supported by the monitor display.
Please change your input timing to 3840x2160, 60Hz or any other
monitor listed timing as per monitor specifications.
This means that the monitor cannot synchronize with the signal that it is receiving
from the computer. See
Monitor specifications for the Horizontal and Vertical
frequency ranges addressable by this monitor. Recommended mode is 3840 x 2160 .
You can see the following message before the DDC/CI function is disabled:
The function of adjusting display setting using PC
application will be disabled.
Do you wish to disable DDC/CI function?
Yes
No
When the monitor enters the Standby Mode , the following message will appear:
Going into Standby mode...
Activate the computer and wake up the monitor to gain access to the OSD .
If you press any button other than the power button, the following messages will
appear depending on the selected input:
No DP Signal form your device.
Press any key on the keyboard to wake up.
If there is no display, press monitor joystick to open up the
Menu and select the correct input source.