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This sounds to me to be a problem with the CFL tubes, soon they will stop working altogether and your diplay will be very dim, or may not come up at all. In which case if under warranty return it, if not you may need to replace the CFL tubes.
The problem can be caused by 1 of 2 things either your power supply is going out or the backlight bulbs are going out. The most likely cause is the power supply. If you are willing to do a little soldering you should be able to do the repair. If you go to our web site at: www.ccl-la.com/badcaps.htm We have a section on monitor repair. Look under the Samsung 930B it is the same as your monitor. If you don't want to do it yourself we do offer a repair service, email me if you are in need of that.
Try changing the cable that connects the monitor to the computer, that might improve things slightly, but because you said that it works for the first 15 minutes I'm skeptical that the cable has anything to do with it.
The monitor is near the end of it's life. There's not much that can be done.
You could have a bad "inverter" or flourescent backlight tube, or a problem in your power supply.The only way to isolate the problem is to check each component in sequence.If your hard disk and DVD / CD drive are still working when your screen goes dark, then I'd say it's the "inverter". You'll have to take it to a repair shop.