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This problem is usually caused due to a faulty microswitch in the brightness button. To rectify this, you'll have to change this switch.
Get your monitor serviced by a qualified service personnel.
Hope this solves your problem. For more help or clarifications, please reply. Thanks.
CLick start/run then type in dxdiag. Go to the display tab and click test dirext3d. There should be an 3d cube that comes up and spins around. After the cube leave cancel everything else and close dxdiag, Your problem should be solved for a pretty long time. If it happens again just follow the steps again.
sounds like your "brightness" button may be stuck. try pushing it and see if it feels the same as the other buttons (should feel it "click" a bit). Also see if any of the other buttons work, because if it IS stuck, they probably won't work...