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System preferences>Displays, click color tab, choose the color profile that is at the top.
That's the default color profile.
 
What did you press?
Does anything happen when you hold down: control+option+command while repeatedly tapping the comma key?
 
Did you press the f keys to brighten it all the way? Or, did you go into system preferences?

i pressed some keys while moving my macbook by accident!
 

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