Right mouse click anywhere on the blank wallpaper background on your main screen, then choose properties from the drop down menu, then click on the settings tab, then the advanced button on the lower part on the display properties window. Once opened you can navigate to the tabs to adjust your display. good luck,let me know how you fare.
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Thanks for trying but I found how to adjust the brightness of my screen and here is how i did it. I held down the function key (lower left of keyboard) then pushed the f7 button a few times and that did it! For brightness you would push the f8.
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