What's strange about this problem is that it's the second time that it's happened to me (once a few months ago). I've got an iBook G4 from a few years ago, never had a problem, but out of the blue today my computer took about 15 minutes to get to the main loading screen. Everything is slowed down immensely, so I'm not really sure what to do. I checked the activity monitor and it seems okay, although it spikes on the disk activity screen randomly even if I am not running any other programs for both data read and data written.