I receive the following error when I try to boot to knoppix "could not find filesystem, dropping to a very limited shell"

The knoppix 5.1.1 .iso image was verified through md5sum, burned to CD and booted up and ran fine in an old Dell Dimension desktop, but this CD will not boot up in my current machine:

Intel DP35DP motherboard
Intel E8400 processor
Kingston 1GB PC6400 DDR2 800 memory
Samsung all write DVD drive


This machine boots up fine to Ubuntu 8.10 32 and 64 bit live CD and install, Slackware 12.1 install, Debian 4.0r5 install, Kubuntu 8.04 32 and 64 bit live CD and install, but will not boot to Knoppix 5.1.1 CD or Feather Linux.

I tried disabling one core to see if the dual core was the problem, but I can't figure out why Knoppix is not booting.

Does anyone have a suggestion?

I would really appreciate any help as Knoppix has become my OS of choice above any other Linux distro.