You have an Old-World Mac. There are no LiveCDs that can boot them.
Before you install Linux, you might have to mess with stuff in Open Firmware (although perhaps OS X has done that already). Your model is notoriously difficult to boot. In case you need to, here are some resources:
http://www.penguinppc.org/bootloaders/quik/quirks.php
http://www.netbsd.org/Ports/macppc/models.html
I've had experience with Debian 3.0 (woody), which had floppy images that you can use to boot the Debian installer on Old-World Macs in this directory:
http://ftp.debian.org/dists/woody/ma...c/images-1.44/
* the "boot-floppy-hfs.img" is a MacOS boot floppy that loads the Linux kernel and asks for the "root" floppy
* the "root.bin" is the root floppy it asks for and starts the installer
I think the current Debian 3.1 (sarge) also has similar images. Make sure to write these floppy images raw onto the floppy with "dd" or something similar; Mac Disk Copy sometimes messes up the image if you don't lock it.
Make sure to read the installation manual (
woody,
sarge). You should have the installer install the "quik" bootload