Acer CB241Y bmirux 23.8" Monitor - Manual (Page 33)

Troubleshooting
Before sending your LCD monitor for servicing, please check the troubleshooting list below
to see if you can self-diagnose the problem.
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
setting.
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 if the computer system is switched on
and in power saving/standby mode.
If OSD Lock is On, the LED status set Amber.