Hi find out what native resolution your mac uses.

Then boot with the knoppix DVD. At the boot prompt press F2 and F3 to see all cheat codes.
I think it will work with correct screen parameters try

knoppix screen=800x600

(or whatever your mac uses)

At the desktop, you should be able to see your mac hard drive, if not open a terminal
and type (as su)
modprobe hfsplus

This module should allow knoppix to read the mac file system. Bot sure of write support,
you may have to google this.