Macbook display darken on startup?

Hi Guys,
Quick question about my macbook.
For quite a while now, on startup, the display brightness is darker than what it previously was.
I will go into sydtem preferences, brighten the screen, hen often when re-starting or waken the computer from sleep - the screen will be daken again.
Is there a little trick that I'm missing here?
Cheers

Begin by holding the power button down to do a hard shutdown. Then start in safe mode by holding the shift key down immediately after pressing the start button until you see a progress bar. Let it start this way and then try a normal restart.
http://docs.info.apple.com/article.html?path=Mac/10.7/en/mh21245.html
https://support.apple.com/kb/HT1564

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Freeing Up Space on The Hard Drive
1. See Lion/Mountain Lion/Mavericks' Storage Display.
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*The following User Contributed Tips are located in the MacBook (Original) > The MacBook Display forum:*
<pending>
*The following related tips are located in other areas of Apple Discussions:*
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Macbook display darken on startup?

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