Why I can't change boot from Os 9.2.2 to OS x 10.3.9?

On a Power Mac G4 400 PCI when I boot from OS 9.2.2 and at the end I select the other system OS X 10.3.9 to boot, the computer restart, chime is ok but the monitor is black. The OS X is not loaded. To solve the problem I put the OS 9 on the slave HD and the OS X on the primary HD; when I zap the P-RAM the computer select the system on the primary HD so OS X is loaded. I obtain the same problem when I try to boot from the original installation CD of OS X if I have shutdown with OS 9. If I zap the P-RAM and then press "c" I boot from the CD of OS X. With OS X 10.2.. there are no problems.
PM G5 Dual 2.3/iBook G4 800/PM G4 400/MacBook 1.83   Mac OS X (10.4.8)  

Hi Redux,
these articles might help:
Mac OS X: What's stored in PRAM?
Resetting your Mac's PRAM and NVRAM
It could be a problem with your backup-battery.
If this answered your question please consider granting some stars: Why reward points?

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