50012122 F65F3Bae0C THere’s a simple HOW TO on adding a LED to an Apple keyboard. Arkku writes “I opened up the keyboard (three screws in the bottom), located the +5v and ground leads (red and black wire in my keyboard) and soldered a 3.3v/30mA 5mm bright blue LED to them, with a 68ohm resistor. To make the light reach the clear base of the keyboard, I also made a small hole in the white plastic that touches the clear acrylic at the bottom of the keyboard and taped the LED in that hole with electrical tape.” Link.