I have an iMac Core Duo with the bluetooth mouse and keyboard option. The mouse works fine and the keyboard mostly functions correctly except for one thing: the caps lock key doesn't work. The LED doesn't light and the caps are not locked. I know it's not a broken keyboard, because strangely enough the caps lock DOES work when I boot in to Windows. Also I borrowed a friend's identical keyboard and the same problem occurs. I downloaded that recent keyboard update thing a while ago but that didn't fix anything. Any ideas?