When the monitor does not support a particular resolution mode you will see the following message:

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 2048 x 1280 (VGA input source) / 2560 x 1600 (DVI/DisplayPort input sources) / 1920 x 1200 (HDMI input source).

You will see the following message before the DDC/CI function is disabled.

When monitor enters Power Save mode, the following message appears:

Activate the computer and wake up the monitor to gain access to the OSD

If you touch any button other than the power button one of the following messages will appear depending on the selected input:

VGA/DVI-D/DisplayPort/HDMI/Component input

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Dell 4688513 appendix VGA/DVI-D/DisplayPort/HDMI/Component input