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Your iBook hard drive died. That's the symptoms unmistakably. Several months of random crashing, then one day it's dead. The data is lost along with the drive. AppleJack can't fix this one. Only a drive replacement will fix it. Sorry. Next time, when you experience crashing, open Disk Utility (in the Utilities folder). Long before the drive fails, you'll see a red message toward the bottom of Disk Utility indicating that the drive is failing. Good Luck.