Use the self test feature.. follow the steps..
1. Turn off both your computer and the monitor.
2. Unplug the video cable from the back of the computer.
3. Turn on the monitor.
If the monitor is functioning properly, you will see a box in the illustration below.
This box appears during normal operation if the video cable becomes disconnected or
damaged.
4. Turn off your monitor and reconnect the video cable; then turn on both your computer and the
monitor.
If your monitor screen remains blank after using the previous procedure, check your video
controller and computer system; your monitor is functioning properly.
Warning
The Power supply inside the monitor can be hazardous and donot open the monitor while power on.
Donot work with the monitor when it is open and the power supply is on.
If there is something wrong with the input signal, a message appears on the screen or the
screen goes blank although the power indicator LED is still on. The message may indicate
that the monitor is out of scan range or that you need to check the signal cable.
Testimonial: "Thank you very much. I did this but it took about 5 or ten minutes for the squares to show up. Blue power lite kind of stutters until squares show up"
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