| I have the same computer albeit a Dual 1GHZ.
Have you tried reinstalling OS9 from the OS9 disc?
Just a thought: It's possible that the last time those drives were formatted that the OS9 drivers were not installed or perhaps they're corrupt.
If possible erase one of the drives and reformat, ensuring that the OS9 drivers box is selected. The install OS9 and see if it will boot.
Let us know how it goes. -Goodluck!
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24" iMac 2.8GHZ Core 2 Exteme OS 10.5 | 4GB RAM | 1TB HDD
Dual 1GHZ G4 MDD OS 10.5 | 2GB RAM | 800GB HDD | iSight
TiPowerBook G4 1GHZ OS 10.5 | 1GB RAM | 60GB HDD
80GB iPod | 8GB iPhone | 4GB Nano |