Q: My computer won't boot from CD. What should I do?
A: Look in your computer's BIOS (http://www.wikipedia.org/wiki/BIOS) (on many computers you need to push the "delete" or F1 key during the POST) to see whether it is set to boot from CD. If this is already set, your computer may not be able to read the CD (some notebooks have problems with black-coated CD's, for example).
I have a weird problem; out of three computers (two laptops and a desktop) just one laptop would boot knoppix from a 5.01 CD I just burnt. However, all the computers would boot from an XP cd, and those which would not boot from the knoppix CD have no problems reading files on the CD after they boot up in Windows.

Could this still be explained by the fact that "some notebooks have problems with black-coated CD's" or could there be some subtle problem with the image?

TIA,

Agasfer