Blinking system folder

Hi. I'm a IT tech at a high school and I came across a teacher's computer. The system folder was blinking with a question mark at start up, so I used Diskwarrior 4.0, and managed to repair permissions. I also rebuilt the directory, and the program said directory successfully rebuilt. When I restarted the computer it booted from the cd again. I ejected the cd and restarted, but the blinking system folder with a question mark came up again. I then used a 10.1 install cd's disk utility to repair permissions, and everything seemed ok, until I restarted the computer again, and I get a blinking folder with a question mark. I then used a 10.2 install cd's disk utility to repair permissions, but the repair button was phased out. (I guess it could not see the hard drive) and it gave me an error when I checked the files and folders option. I finally used the Diskwarrior 4.0 again, but when I tried to rebuild the directory for a second time it gave me this error:
'The directory of the disk "unknown disk" cannot be rebuilt. The original directory is too severely damaged. The disk was not modified. If you report this error, please mention the error code (2155,-57).'
Is there anyway to access the files on this hard drive or is it totally gone?
Would Diskwarrior 3.0 help?
If anyone can assist me in this matter, it would be greatly appreciated.
Btw, the computer is an imac G3 crt 500mhz indigo slotloading powerpc with a 10.2.8 operating system.
Thanks in advance,
Rayan

Try a new hard drive. Takeapart for swapping drives - slot load is a good pictorial if you have never replaced a drive in one of these machines.
'Bet it's a failed drive. It's showing all the usual exasperating symptoms.
David

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