I'm having difficulty upgrading my registered MOS 2.5 installation to 2.6. Mac Mini just won't boot off the CD. When I hold the "C" key on powerup the CD is ejected each time. If I use "Alt/Option" key to get into Open Firmware boot menu, there is no option to boot from CD.

Also, in Open Firmware prompt "boot /pci/cd boot.img" will result in error message "can't OPEN: /pci/cd"
and "boot cd boot.img" will append "load-size=0 adler32 = 1" to the command and than report "LOAD-SIZE is too small".

Note that I don't have Mac OS X on Mini (only MOS 2.5 is installed).

The CD is definitely valid as I have successfully installed from it on PowerMac FW800 (to be registered when I complete installing all the applications).