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2. Run fsck (file system check) from the command line (Boot, hold CMD+S after the chime. When prompted at the bottom of all that scary command line stuff, enter '/sbin/fsck -fy' then hit return).
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3. The ultra-cautious among us (though not overly cautious) will boot the machine from an installer CD and repair the disk (at least verify it) with Disk Utility.

These steps do the same thing.
 
how do i wipe the drive if its locked? pressing options at start-up brings a paddlelock and space for PW booting holding C with disc in does not engage. any ideas? its an ibook 800 mhz G3

With the CD loaded, you can select it in Startup Disk (System Prefs), then hit Restart.

BTW, what 'options' are you pressing at startup?
 
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