Acer S220HQL - Manual (Page 27)

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English
DVI/HDMI mode (Optional)
Problem LED status Remedy
No picture visible Blue Using the OSD menu, 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.
Blinking Blue Check if the video signal cable is properly
connected at the back of monitor.
Check if the computer system is switched on
and in power saving/standby mode.