I had the same problem with this monitor and I did not find anything wrong with the power supply so I replaced the main control board and the monitor has worked ever since.
Could be puffy capacitors that are causing the monitor to shut down. Only way to know would be to open up the monitor and see if you find any. If you do then make sure you replace them with capacitors with the same UF value, voltage can be the same or higher.
The other thing to do to verify if its a monitor problem or video card problem, try another known working monitor on the computer and if the monitor stays on then you know its a problem with the original monitor, if the replacement monitor doesn't stay on then you know its a video card problem.
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Please post back what you find.
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