Hmm. I think the GFX chip has come loose in my iBook G3 900 14″. Apparently the iBook’s had this screen issue with the cable being pinched causing the screen to black out completely after a while when the cable dies. My screen blacked out completely so I though it was that. But if I twist the case a little bit, and reboot, it comes back…same if I put pressure when the GFX chip is. I read that they can become loose if you knock the laptop around a little bit because it was a manufacturing problem and I used to carry it in my bag.

Aparently I can open it up and put a shim in it to pressure it back into place.