Just to make sure, when you are in the / directory of the knoppix CD what files do you see? If all you see is a knoppix.iso file you didn't burn the CD correctly. Also what version of knoppix are you downloading, it's the newest version correct? If you have done everything correctly, then I would think you have some kind of unsupported hardware. Perhaps if you list your knoppix version and your hardware, I can look to see if you have unsupported hardware. Also does any other bootable CD boot successfully on your system?