Sounds like something got weird in openfirmware.
I'd boot into a rescue shell from an install disk, and at the second yaboot boot: prompt, hit -tab- to stop the countdown, and type:
(or whatever rescue option is shown, ie rescue-powerpc64 for G5's) and then get to a shell on your root partition. For default installs where guided partitioning did it all automatically for you, it will probably end up being /dev/sda3 or /dev/hda3 etc.
Then as long as your /etc/yaboot.conf file is ok, redo ybin
Code:
ybin -v -C /etc/yaboot.conf
In the rescue mode, you are already operating as root, so no need for sudo. Exit the shell (just type exit and reboot.
Ideally it should no longer go into a loop..
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