Brightness Keys (F9 and F10) Do Not Function

For the life of me, I can not adjust the screen brightness using either the F9 or F10 keys. I have to go into System Preference>Displays and then use the brightness slider to adjust it higher or lower. The "Automatically adjust brightness" button is unchecked.
Not having functional F9/F10 Keys is very annoying.
Only had this Intel-based MacBook Pro for 3 days and already a problem.

Welcome to the Forums!
Not the MBP's problem, actually, just that there's more than one kind of brightness to control - we say "it's not a bug, it's a feature"
The F9 and F10 +do not+ control screen brightness, they control the brightness of the keyboard backlighting (the lights under the keys). The F1 and F2 keys control screen brightness.
You do need to have the box for "Use function keys to control software functions" unchecked as the previous poster indicated, or if you need those keys for software functions, you can use Option + F-key to control hardware.
Now, when you press F9 and F10 and see the prohibitory sign, that is because the keyboard backlight only operartes in dim light. So, go into a dark room, your keys will light up, and F9 and F10 will control that brightness.
Hope this helps...
EDIT - Ps. Saw your post in another thread as well. If, in fact, the F1 and F2 are not changing screen brightness, post back.

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by vijay kumar ([email protected]):
Are u running ur application in web?
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<HR></BLOCKQUOTE>
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Brightness Keys (F9 and F10) Do Not Function

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