First you need to isolate the problem to either the computer or the moniter. I would sugust that you hook a know good moniter to the compter and go from there. If the other moniter works then you have a moniter issue aif not chek the video card in the computer. good luck
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That would be your backlight failing on you. Very common on anything with a lcd display. It will be covered under warrenty so check that. Also make sure you know what a replacement screen is worth as it might cost as much as a new monitor to fix, the parts are cheap but the labor isn't.
It will probably blink out more and more and then fail totally. The lcd itself is still showing the picture but without the backlight you can't see it other than perhaps a ghost image at an angle. There are replacement/repair kits for the backlight power board (if that model has a seperate board) and replacement lamps. You can do this as a diy fix with a little care and a few jewlerrs screw drivers and such tools.
Change the screen resolution. The video card or video display may not be compatible to the supported video setting of the monitor. Try changing the video resolution to a lower setting such as 1024x768 and bit depth to 32 bit.
If you have your proof-of-purchase and it shows the monitor is less than a year old, it would be covered. You would need to follow the procedure on their website to have the unit repaired or replaced, but it would not be your job to try to fix it.
You have to
check if you can see the image on the screen or not after it went blank (Power on both CPU and monitor) by shining a flashlight into the
screen, not directly but find the best angle to the screen and take a look very
closely. If you can see the icons or any image, there will be a minor problem.
Like mine, I can see window image using flashlight and check lamps inside. Some
of them were broken and it is very easy to replace. If you cannot see anything on
the screen, there'll be some problems with inverter board. If you have
soldering tool and want to fix it by yourself, check the caps first. It may
cause this problem. Some caps might show leaking or burn spot on the board
because of too high temp. If you don't have soldering tool, you better go get a
technician to do so. Thank you