| Fix for Macbook brightness and volume keys
I had the same problem and after years of frustration fixed it. It's not the checkbox on the function keys preference as some have suggested.
I did 2 things simultaneously so I cant say which actually worked but both are simple. Using spotlight find every folder named "PlugIn" and rename it "Plugin". My macbook pro had 2 of these. Restart and when the desktop comes up during reboot, hit the volume and brightness keys ever 0.5 seconds or so. Fixed.
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