Acer P199HQL - Manual (Page 27)

15
DVI mode
Problem LED status Remedy
No picture visible Blue Using the OSD, adjust brightness and
contrast to maximum or reset to their
default settings.
Off Check the power switch.
Check if the AC power cord is properly
connected to the monitor.
Amber Check if the video signal cable is
properly connected at the back of
monitor.
Check that the computer system is
switched on and in power saving/
standby mode.
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