Are the settings on the video output correct? Is there a green or orange light illuminated. There is a difference between the Power LED and the Signal LED which is green. If you have no signal the LED will remain orange or yellow but not green. If the LED is green, then a signal is getting from the PC but not necessarily good. Check the signal with another monitor or TV if you can. Check the cable.
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disconnect all the cables except the power cable and then turn the monitor on you would see a test screen if it still happens your monitor is faulty and better buy a new one as repairing is usually expensive .
Make sure the power connector is secure with your monitor and the adapter power light is on as green. If not working at all then just contact with AG Neovo as [email protected] for 3 yrs warranty repair. But you probably have to cover the one way shipping only.
Call the service dept. in the above post. Tell them the model and serial number of your monitor and order a backlight inverter board(approx. $35 plus shipping). Open up the monitor and plug it in, should fix the problem. This problem could also be caused by one or more backlights(small flourescent tubes) being bad. I just fixed a Neovo F-417 display by replacing one of the backlight assemblys. I also just fixed a Neovo E-17DA monitor by replacing the inverter board.