I can't change the brightness on my macbook pro. i tried the buttons on the keyboard, went to settings and tried to do it from there, didn't work. i have restarted my computer as well and that didn't make a difference. please help

i can't change the brightness on my macbook pro. i tried the buttons on the keyboard, went to settings and tried to do it from there, didn't work. i have restarted my computer as well and that didn't make a difference. please help.

Reset the PRAM and SMC.
Barry

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