Does it start when you reboot the machine for the first time after installation? During installation it is normal? When you boot and press 'e' while grub is booting can you edit there? If Knoppix doesn't show the boot screen, can you enter some Knoppix command line (before installation) and type something?
(At least you can use the dd command
, just kidding)
Did you try to boot from a totally different Live CD, other version etc, other distro, and is that working right?
I take it you have a standard kbd? Not a USB? If so, can you try and replace with a PS2? Just guessing, could the BIOS USB driver be in the way of the Linux TTY driver?
jlinkels