The G4 powerbook runs a PowerPC CPU and Knoppix is compiled for x86, specifically 486 and up. So Knoppix will not run on a powerpc system. You will need a live CD designed to run on the powerpc architechture. Ubuntu 5.10 has a powerpc livecd at http://releases.ubuntu.com/5.10/ubun...ve-powerpc.iso which I found here http://releases.ubuntu.com/5.10/