Try this link:
http://www.securemac.com/foolproof.php
If that fails, boot from an external SCSI device, holding down the keys that suppress booting from the default hard disk. Then use a disk editor to mount the internal disk (NOT mounting in the Finder) and examine the boot blocks. If you can identify the formatter that wrote the boot blocks, try using that formatter to rewrite the partition map. Advanced tools can do that without forcing a complete reformat. If that fails, try wiping out individual blocks that might load the protection software when the System file or Finder is loaded. There are further tricks to try that should mount the disk (temporarily destroying its bootability) if the above fails, assuming that the disk is not encrypted.
But why bother. The disk was protected for a reason, so respect it. Follow the instruction in the first sentence of the previous paragraph. Then use your favourite formatter to wipe and repartition.
http://www.securemac.com/foolproof.php
If that fails, boot from an external SCSI device, holding down the keys that suppress booting from the default hard disk. Then use a disk editor to mount the internal disk (NOT mounting in the Finder) and examine the boot blocks. If you can identify the formatter that wrote the boot blocks, try using that formatter to rewrite the partition map. Advanced tools can do that without forcing a complete reformat. If that fails, try wiping out individual blocks that might load the protection software when the System file or Finder is loaded. There are further tricks to try that should mount the disk (temporarily destroying its bootability) if the above fails, assuming that the disk is not encrypted.
But why bother. The disk was protected for a reason, so respect it. Follow the instruction in the first sentence of the previous paragraph. Then use your favourite formatter to wipe and repartition.