I am booting up Knoppix 6.4.4 from a thumb drive on an older Dell Inspiron, but after booting up, it changes to a black screen with a bunch of vertical lines of different colors...and that's it. There is nothing else. It will boot fine on my other newer Dell laptop, but not this one. I've tried many of the cheat codes to get something to work even if it is not optimal. It won't even display in text-only mode...unbelievable. Diagnostics on the hardware indicate things are ok, except for the hard-drive and cd-rom which I am not using.

Any ideas on what to do???