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when you press the keys did you press also the Fn key (usually sets beside the window key.)
it should be Fn + bright positive key. you need to press both...hold fn then tap the bright positve key.
or right click on desktop
go to properties (if you have an intel chipset or other VGA chipset) you will see a Tab with the title of your VGA (like Intel Graphic Media ....) click on the tab, from there look for a button in which you can change the graphics settings...it will give a a new window which you can change color, brightnes, gamma etc..
Go to Control Panel...to DISPLAY...and you should either find a adjustment there to brighten your screen. Or look On the "F-Series" keys or somewhere on your keyboard for a Brighten SUN or dark SUN, which you have to press the blue key along with that F series key to brighten or darken the laptop. Good luck