Dell ST2320L Monitor - Manual (Page 22)

OSD Warning Messages
When the monitor does not support a particular resolution mode you will see the following message :
or
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. The recommended mode is 1920x1080.
When monitor enters Power Save mode, the following message appears :
or
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 message will appear:
or