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Sounds like T'Con board fault. Contact any service technician. When video signal interfaces, it goes overloaded. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter". http://electronicshelponline.blogspot.com/
Kindly connect same input to a different device and if that is ok, check whether the input for the TV is selected properly for the input connected. If it does not work, this might require attention by a qualified service technician.
The Samsung SyncMaster 940MW monitor has an issue with the power supply # IP-46135T going out. The flashing power light or not turning on are the classic symptoms of this issue. Check out our web site at: www.ccl-la.com We have a step by step repair guide posted that will guide to doing the repair yourself. It involves changing a few capacitors on the power supply. If you can solder then you should be able to do the repair yourself. If you don't want to do the repair we do offer a repair service for $35 plus return shipping. If you have any additional questions just let us know at: firstname.lastname@example.org
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