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One addition. My MacBook's volume control also behaves strangly. When power adapter is connected and I put my mac to sleep, then after wake up the volume control does not respond for a while. On the screen I can see that I am changing volume but the icon on the menu bar does not respond to it...

I have a strange problem with my MacBook. I zaped my pram and now every time I restart my mac the screen brightness is at the max level. Before zaping the pram the screen brightness after the restart was always the same as before the shut down. Now the screen brightness is always at the...