Dell P2223HC 21.5" 16:9 IPS Monitor - Manual (Page 62)

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Operating the monitor
OSD warning message
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. The recommended mode is 1920 x
1080 .
Factory Reset Restore all preset values to the factory default
settings. These are also the settings for ENERGY
STAR
®
tests.