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Look at the monitor at and angle from the top, bottom or side. You are looking for a faint picture of what you would usually see. You will need some good light to see this. If you do see a faint picture this means the backlight on the lcd is broken. I would get a new monitor, I would not recommend trying to replace the backlight.
Hello, it may not be the monitor. It could be that the pc is not talking to it. To check this try another monitor. If it doesnt work on that one,its the computer thats faulty, usually the video card. If however it does work, you have a faulty monitor. They can be fixed or replaced. Or you could try your monitor on another pc, either way you will find out for sure. I hope I have helped.
Faulty power PCboard. Reasons and the exact problem may vary. Main components to check: The fuses, the stabilizing capacitors on the low voltage, the impulse transistor, the optron and the pulse width modulator (PWM) IC.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed GATEWAY and other monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums Post back what you see inside so we can guide you further and it will help out other people in the future also. http://en.wikipedia.org/wiki/Capacitor_plague http://www.badcaps.net
The next thing to try would be to resolder all of the connections on the transformers in your monitor. If you can take a few pictures of the board and email them to me I will mark the points to check and send it back to you.
Probable failed power supply.
If you look at the screen on an angle after your system has finished booting and see faint images, it is the backlight or is associated high voltage power supply that has failed.
If you see no 'shadows' at all, then the main supply has failed.
Either one of these could be a separate supply since many manufacturers buy from specialized companies.