This condition is with a 600mhz 14" ibook. It happened about a month ago and I have been using an external mouse since. The mouse pad has stopped working. If I do not plug the external mouse in the pointer stays at the upper left of the screen. If I unplug the mouse the it stays where it was when I unplugged it, it does not respond to the mouse pad. This condition started suddenly. When it first happened I was turning it on. At the time I suspected that it was a software relater issue. However, at this point I can not remember why I though that.