Hi

I tried to boot from a freshly downloaded Knoppix-5 image on my laptop but when X is launched it presents a wite screen and that's it.
I did several attempts with various cheatcodes but none was helping me.

Then I booted up with

knoppix 2

which keeps Linux in textmode. Next I did

X -configure

this created a new //xorg.conf.new file.
I tried next

X -config //xorg.conf.new

and now X came up with a normal canvas. Last step was

cp //xorg.conf.new /etc/X11/xorg.conf

init 5 brought up everything normal

This may help others

Kees