My iBook 600 (16VRAM) has had an issue with the Fn key usage for a while, and I'm to the point that is is bugging me enough to ask for help. The situation is that all the Fx keys work as the Fx key only when I *don't* press Fn. Thus, to adjust the brightness I have to press Fn-F2, instead of just F2. To eject a CD I have to press Fn-F12, instead of just F12. This doesn't carry over for the other Fn-based keys. I still have to press Fn-Down arrow to jump a screenfull at a time. I went into the Keyboard an Mouse CP in 10.2.8 and it has the keyboard focus control tab. To activate/deactivate the keyboard focus control you press Fn-Ctrl-F1. For me that doesn't work, I just press Ctrl-F1 and the check box checks/unchecks.