@ utu and Werner Maybe it is of any interest for you.... I tried the Knoppix Version 6.7.1 with kernel 3.0.4 and installed it to two different brands of USB sticks. Both showed the same result: The Cheat-code had to be placed at the line DEFAULT and not at the line APPEND to be effective! My entry in syslinux.cfg is now like that: DEFAULT knoppix nodrm (and/or) nomodeset Again, Thanks for the support