The F key on my Powerbook wasn't registering, so I took it off and examined it. Looks like the previous owner spilled some soda in that area of the keyboard, because if I turn the keyboard illumination all the way on and the screen off, you can totally see a darkening of the keys in that area. Anyway, I could figure out how to put it together but the part is just so small. There's 2 little plastic pieces (and I mean little) that snap into the key, and into the keyboard. Plus a little clear widget I'll call it, that registers the key press. I can't seem to get that in the right location as to facilitate normal function from the F key. Now, I don't use the Powerbook's keyboard at all, I actually use that computer as an iMac, with the Aluminum Apple Keyboard and Mighty Mouse and a 20" LCD monitor. But I would prefer the key to be in place and functional, considering I every so often take it with me. So if you guys have any tips, tutorials, anything that could help me, I would greatly appreciate it.