Warning: If you dont know what you are doing, don't attempt this! You could destroy your laptop. Do it at your own risk. I have many Macs one of which is the Powerbook G4 12" Aluminum. Recently the backlight died. I opened it and started looking around for the reason. I have a background in computer design. I found that the backlight connector has four wires. Red: +V Black: Ground Green: Must be High (+5V) for light on/low for light off (turns inverter board off and saves power). Yellow: Steps of brightness (up to +4V). I realized that there was no 12V coming on the header (the red wire had no 12V). I pulled the backlight connector from the motherboard (the connector is right next to the fan). I stripped the fabric cover off the backlight cable harness to expose the four individual wires and then I cut the red wire 1" away from the header, and soldered a wire from the power supply board to this red wire (going to the backlight), and insulated all the connections and the bit of red cable hanging from the old connector. I plugged the connector back to the motherboard. Now three wires go the motherboard and the fourth (the red one) goes directly to the DC-to-DC Power supply. The 12V power supply spot on the DC to DC power supply board is not indicated but is the one, counting from the left, that is not labelled (there are four pins carrying 12V) in the row of power connections (the others are 24V, 3.3V, 5V etc). Voila! The backlight works fine again. No need to spend money on a new motherboard or backlight board. It pays to look around first before spending money and getting new boards.