NEC MultiSync LCD1550V Service Manual page 25

OSM Warning
OSM Warning menus disappear with Exit button.
NO SIGNAL: This function gives a warning when there
is no signal present. After power is turned on or when
there is a change of input signal or video is inactive, the
No Signal window will appear.
RESOLUTION NOTIFIER: This function gives a
warning of use with optimized resolution. After power is
turned on or when there is a change of input signal or
the video signal doesn't have proper resolution, the
Resolution Notifier window will open. This function can
be disabled in the TOOL menu.
OUT OF RANGE: This function gives a
recommendation of the optimized resolution and refresh
rate. After the power is turned on or there is a change of
input signal or the video signal doesn't have proper
timing, the Out Of Range menu will appear.
CHECK CABLE: This function will advise you to check
all Video Inputs on the monitor and computer to make
sure they are properly connected.
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