Today I got a G4 466MHz and wanted to do a clean reinstall of OS 9.1. I took my original retail Os 9.1 CD (not an bundled to a machine one) an tried to boot. CD-Rom starts to seek for a system, even the blinking system folder icon seems to wait some seconds like any system is found, but then it doesnt start from CD.

First I thought the CD drive is broken, and changed it to a known working one - same behavieor no booting. The MacOS 9.1 CD is also working verry well normally (as long as no upgrade card requires 9.2.1), and now the big showdown:

Debian is booting without any problems from CD at this G4 466!

Any ideas why I can´t boot 9.1?