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Mostly it is a hardware related problem such as Diskfailure.
Try to startup from the Tiger installation disc and go to Utilities/Disc Utility.
Check/repair your disc structure / filesystem and file-permissions.
If it's the harddisc it will show up in this programm.
If so; connect your Mac to another Mac with a firewirecable and try to save your files etc.
After that you will have to exchange your harddisc.
Goodluck!
Greetings from the Netherlands / Germany
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