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This type of monitor problem is usually cause by a failure of the capacitors in the power supply board. What is happening is the power supply is not starting up correctly so the back lights are not coming up to full brightness. Here is a link to a repair guide that will show you how to dis-assemble the unit and repair the power supply board. http://www.ccl-la.com/blog/index.php/repairing-the-samsung-225bw-22-monitor/ If you can do a little soldering then you can do the repair yourself.
You need to use flat thin blade screw driver to crack open the case, starting at the bottom edge of the case first, you may need two screw drivers, when it starting to come apart, leave one screw driver in the partially opening section so it not snap back together while you tackle another section of the case. Most monitors cases these day do not have small slot to show where you should crack open the case at, they just do not want you to fix it.
First check the monitor sleep mode for your monitor in windows control panel, check that its not going into hibernation/stanby. if thats not it. and the monitor keeps shutting down. You may have to replace it newer models have more features and could be cheaper by saving you the hassel check newegg.com or orverstock.com
check your video card connections. make sure that your monitor cable is attached firmly in place.Also make sure the video card is fully pushed into the slot on the
motherboard. Sometimes because of heat the card can pop out of the
slot. Sometime this is just enough to barely work and then stop.
did you verify that the USB port is active and the cable is working? Check under the Apple menu for "about this mac" then click on more info. Click on USB to see a list of active USP devices. If the Barco is connecting it will show up in the list. May not say Barco, it may say unknown device but it lets you see that the cable and port are working. If not replace them or try it on another computer. If they are working then the Calibrator Talk software may be configured wrong, have you contacted Barco? They have a troubleshooting area on the web site.