Are any of the other buttons working, like the Expose, Dashboard, and volume keys?
If not, then you may have disabled the function keys. Go to System Preferences and click on Keyboard & Mouse. Under the keyboard tab, check to see whether the "Use all F1, F2, etc. keys as standard function keys" option is enabled.
make sure you have the option that Kash was talking about Check Marked... (enabled)The volume and expose keys were working before I enabled the feature; now they're not working at all.
make sure you have the option that Kash was talking about Check Marked... (enabled)
also, for you keyboard backlight problem - the ambient light has to be pretty low for the keyboard backlight to be activated... If it is bright out, the keyboard backlight brightness buttons on your keyboard will not work.
That is how that works. If the box is checked, you need to press fn to use the secondary functions. if the box isn't checked, you need to press fn to use the function keys as f1, f2, etc...
Totally correct.
Running the Aluminum keyboard here on iMac G5 iSight. That is exactly how it works depending on how that box is checked.
What Mac do you have that keyboard plugged into?
If I missed it, sorry.
It also depends on the monitor:
If you're using a Mac mini and a Samsung monitor, the brightness keys won't work. If it's a Mac mini and an Apple cinema display, they will work.