I don't know whether my problem is fits into the logic board thread, but there are some similarities and I am at my wit's end. I booted up my computer yesterday, got the grey apple screen with the pin-wheel spinning, then when I expected to see the desktop I got a grey screen, then a blue screen, then a green screen, then a red screen. Every couple of minutes I would see a distorted flash of the desktop then back to the parade of greys, greens, reds and blues. Does anybody have an idea what has gone wrong here?
Many thanks
DT
Have you tried connecting your iBook to an external display? If so, does this behavior occur on the external display as well? If it does, you have a logic board issue. If not, it could be a bad lvds cable (have seen this failure path for the lvds cable before) or a bad lcd (extremely rare failure path for lcd's, but it has happened). Of my experience with this issue, I would say that 85% of the time, an lvds cable will fix the ills, 10% of the time it's a logic board, and 5% of the time it's the lcd panel going out. I'm assuming that this is a 12 inch unit. The 12 inch panels that Apple uses are fairly robust and seldom fail without an external influence (drop, liquid, alien attack, etc.).
I hope this helps. I've taken apart and fixed more iBooks than most people see in a lifetime. Fortunately, at my new job there are no iBooks.