Well, I responded to your post in the "Viruses for OS X" thread but I see that the iBook has in fact bit the bullet.
It might be in relation to the following problem:
http://www.applefritter.com/node/10193
Still, if you're inclined to do so you can perform the repair yourself with some help from this site I found just now:
http://geektechnique.org/projectlab/...c-board-repair
I had done a self-repair on an old Apple Airport Basestation years ago when the capacitor that controlled the power unit had burnt out. Apparently, Apple had used caps that didn't meet the proper power requirements. I found
these instructions that helped me solder in a replacement capacitor (with the proper specs for the power demands) and it's worked ever since.