Some people say the iBook G4 has the "video chip coming loose from the PC board" issue. There is also a pin that comes unsoldered on a voltage regulator chip. The latter is fixable. In both cases, pushing on the chip is a temporary cure. A Google search will yield several good hits.

Click to expand...

Ah yes. I've seen many of those affected iBooks and Ebay. I thought about getting one and try to fix it... But I was a little concern on some of the methods to fixing it.

http://geektechnique.org/projectlab/726/diy-obsolete-ibook-logic-board-repair

While the link above may be a little drastic solution. It gives you a basic idea of what might be needed, if that's the problem. (Let's hope not.)

Hope you can get the problem fixed.