Original post by: mrhaehn ,
What was the solution? I have the same problem with my mothers powerbook g4. I turn it on, hear the chime and then the clicking, which I believe is the optical drive initializing, and then it just keeps repeating the clicking like it is stuck in a loop. The display is black the entire time. I pulled the hard drive and was able to access it externally through another mac so I know it isn't that. My thought is that it's the logic board but I don't want to replace it if that's not it.