Boot from cdrom

i am having a problem when trying to boot from cdrom. I received the below message

system is not bootable, boot command is disabledfound

how can i fix this.

also what is the key combination on ordinary keyboard for STOP+A. Is it ctrl+break?

Can you list your OpenBoot Parameters?

You have ended up in the "forth interpreter" at the OBP.

do the following:

ok {} setenv auto-boot? false
ok {} reset-all

The system will reset and then return to the ok prompt. You will be then be able to boot from the cdrom.