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well if u press fn key + (f7 or f8). it is suppose to reduce brightness or increase. But if its not working then check it with service centre. In between you can try an alternate option, if u r using win7 or vista then, look for battery sign near timer. click for more power options. in there u will see adjust brightness!
Decrease Brightness (fn+f7) The fn+f7 hotkey decreases the brightness of the notebook screen. The longer you hold down the fn+f7 hotkey, the more the screen dims. Decreasing screen brightness conserves power.» To increase screen brightness, press the fn+f8hotkey.
Increase Brightness (fn+f8)The fn+f8 hotkey increases the brightness of the notebook screen. The longer you hold down the fn+f8 hotkey, the more the screen brightens.» To decrease screen brightness, press the fn+f7hotkey.
Most times you have an additional key on a laptop called FN mostly it is located next to the windows button (left bottom on your keyboard). On the key the text is in the same color as the brightness logo's on your F8 and F7 keys. Just press that button, hold it and than adjust brightness with F7 or F8.