Hello,
It sounds like something got whacked on your startup volume. First, since OS 9 is working, boot into it, and get your data off the drive. You may not get a second chance at that.
Next, Boot with the OS X CD-ROM. You will get the install screen. Go to the Blue apple in the upper left corner, and select Disk Utility. See if you can repair the disk, and repair the permissions.
Reboot without the CD, and see if that helped. If not, you are probably looking at a format-and-restore.
Christian
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Posting Virtuoso
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since Mar 2004