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it sounds like your graphics card is conflicting weith your flatscreen , i had a sony desktop do the same thing only on a TFT or LCD monitor , you may want to get a better graphics card , my bet is its probly an intergrated one .
hi im josh in cebu phils. Maureen may i help you? If it happened yesterday that the contrast box keep on coming. there's a problem in your monitor.so try to check the buttons if covered with dust cleaning may solved the problem.Maureen if you have the manual use it in adjusting the resolution and if you dont have try to press the button mark + or increase just press both of the to the brightnest as posible so that you may be able to proceed another action. thats all for now.hope i helped you.good luck.