F1, F2 Brightness Keys

Hey guys,
I've noticed that when I press the F1 or F2 key on my Macbook, the little brightness windoid thing pops up and the meter moves accordingly, but yet the screen does not dim nor brighten. I've made sure that the function keys work as function keys without having to press the fn button. I've also tried adjusting the brightness in Display Preferences--all to no avail.
I fear I may have to take this in to the Apple store; any suggestions would be appreciated.
Thanks.

If you've attempted to adjust the brightness with the 2 methods described and tried them in both low light and high light situations, it appears that you indeed have a hardware problem and you need to make an appointment with the Genius Bar at the Apple Store. Don't be afraid of this procedure because it can be both pleasant and informative. As a rule, customers are treated very well. -GDF

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