Led Indicators - Dell 1800FP User Manual

This means that the display cannot synchronize with the signal that it is receiving from the computer. Either the signal is too
high or too low frequency for the display to use. See
this display.
Sometimes, no warning message appears, but the screen is blank, which could also indicate that the display is not
synchronizing with the computer.

LED Indicators

Display State
On
DPMS
Selected Input Mode
D-Sub
DVI-D
See Troubleshooting for more information.
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LED state
Power management indicator is green
Power management indicator is amber
LED state
Input LED 1 is steady green
Input LED 2 is steady green
Specifications for the Horizontal and Vertical scan ranges addressible by