My iBook seemed to die on me a few weeks back...the logic board bad clearly went as if you applied pressure to the palm rest then the screen would go crazy. I haven't used it for weeks...been using my desktop and since the iPad came i have just used that. The iBook has been under the sofa for weeks and probably has got knocked about by work going on in the house. I come to get some files off it today and switch it on and if you now apply pressure nothing happens...it seems to be working perfectly. Very very strange.