New answers tagged powerpc
PowerMac G5 is a "New World" Mac, and it is 64bit only. So you need this image: http://distfiles.gentoo.org/releases/ppc/autobuilds/20150115/stage3-ppc64-64ul-20150115.tar.bz2 Side note: If it's the Gentoo experience you are looking for, obviously you're on the right track. If you are just trying to get a Mac up and running on Linux, I strongly recommend ...
That means it didn't wait for you to press a button; it's already moving on to boot. Did you give it a moment to allow it to boot? It should come up shortly.
Strictly speaking, if you're creating your own distribution based on Debian, the powerpc architecture can be whatever you want it to be; in Debian it's "only" a name in dpkg's tables. If you do change your definition of an architecture though, you'd be better off changing the architecture name; for a good example of what happens when you don't, see Raspbian ...
I had the same problem a while back (Boot to non bootable disk using Openfirmware) and I got around it by booting into the hard disk using install media's rescue mode and installing grub-ieee1275 from the official repos the normal way.
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