Check if the signal cable (VGA / DVI / HDMI / DisplayPort) is well connected and confirmed another end of the output cable has been firmly connected to computer input port (graphics card).Make sure the power button on the front panel is normal for boot.No display after turning monitor ON (not boot, black screen & no power lights) Enter safe mode to adjust resolution or refresh rate which the other LCD can support.Press and hold the "MENU" key and select MENU > System Setup > Restore factory mode (Reset)> select "Yes" If you press the OSD button and menu shows, please use function to return to the initial value of screen.Connected LCD monitor to the other computers (PC / Notebook) to confirm whether it is normal.Replace other identical signal cable (VGA / DVI / HDMI / DisplayPort) to take cross-test.The MENU button's position depends on different models NOTE: If this model doesn't have the button, please press "MENU" to enter OSD menu.
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