BRIGHTNESS BUTTON NOT WORKING?!?!

Hey, I would really like to know
if anyone else has had this problem before.
Its the first time it has ever happend, or anythign
has ever gone wrong with my mac!
The brightness (resolution?) button (looks like the sun)
wont go off.. its stuck on the higest brightness, and i cant bring it down
its also stuck on my screen and wont disapeer.
I tried fixing the button but that didnt do anything.
Restarting my computer doesnt help either.
I am so confused!
Any help or feedback would be welcome
Thanks!!
macbook   Mac OS X (10.4.9)  

ahh thank you so much!
i had a feeling it had something to do with
a external display!
i had just bought one and might have
had it messed up when i unplugged it somehow
but it worked when i plugged it back in!
and now its all good
thanks so much!!

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