Unable to boot live cd Knoppix 6.2

[OErjan]

sounds like a high speed burn, or bad download, if you have not checked the MD5 do so, here is how.
http://www.knoppix.net/wiki/Download...O_CD_images.3F
yes it is important, I have even had a Torrent download corrupted.

also i would try burning the disk at lowest speed you can, yes it frequently does make the difference.
To give you the why means we will need to go into how CD and DVD disks are made and how they work together with how the filesystem works, waaay of topic and VERY technical, let us just accept it.

another common thing is bad compatability between disk and burner, not as frequent as it once was but...

[vhradice]

I have tried the same Cd/DVD in 3 other pcs and both boot fine and run. Other CDs will run in this pc. The Media is good. The drives are good.

What can I run in the debugging window that will tell me what is wrong?

I have looked at the cheat codes, tried some, same result.