Hello everyone, I have an iBook G4 that has recently stopped booting up. A week or so ago it froze up like the computer was thinking or processing, but never got back to functioning normally so I was forced to turn it off. Now every time I start it up I get the zipping sound, the starting chime, then it goes to the gray screen with the apple logo with spinning thing below it for a while, then eventually turns off and goes black screen (It never gets to the password entry screen). I have a feeling that it is the OS software, however I bought the computer used so I do not have the OS CD. Should this be fixed by rebooting the OS CD or do you think this is a more complex, expensive problem?? Thanks for your help!