Spotlight ramdomly started over


I got on my PowerMac G5 2.3×2 this morning and my hard drives were really going to town. I looked up and saw Spotlight was indexing. I clicked on it and it says it’s indexing my computer and will take 15 hours.
That’s really strange. No external hard drives, no new hard drives and no new data. But it’s starting over. I guess that it got corrupted or something.
I’ve had this particular PowerMac for about 2 years, so obviously Spotlight has ran before.
Any ideas?

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