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I think what your monitor is experiencing right now is because of the backlight inverter in your lcd monitor is about to give up...The backlight inverter is a cold cathode light thats responsible for the image in your screen.. if the lights located on the upper and lower edge of the monitor will be busted then what you will see is black screen.. You will need to replace that in your monitor.
However, without the proper skills to do that and proper tools to open the monitor.. it will be risky for the safety of your monitor..
I suggest that you bring your monitor to a credible technician to replace busted backlight or (burned high voltage ballast transformer - supplying current to backlight)
Luckily I'm not in it for the money so here's your answer. (Sorry drumbanger.)
When it goes black, look at your power button. Is it still green? If so, the backlight display is bad. If the power light has turned orange, you're most likely looking at a power/inverter problem. Sadly, if you don't have another monitor that you can swap parts out with, you're looking at a new monitor. But with the economy on the downslide, replacements keep getting cheaper! Research online and you'll find some fantastic deals! Rate me if you find this helpful.
If you got power with no screen or both... Then it's your backlight inverter are busted. Need to replaced or repaired. To repaired look for a capacitors with a bulged on top of each caps. Not sure...just replaced all the caps... Good lucks!
The only place to get replacement parts are for the Dell. Call them up and order the part. The part you will need not the video AD board. What you need it a backlight inverter / power supply. The one you had are busted... or you can repaired yourself...by replaced a few busted capacitors. If you are lucky you can spotted by a bulging on the top of each caps... Not sure, just replaced all the caps... Good lucks!