When the PC begins to boot up, do you see a screen like this? http://shots.osdir.com/slideshows/sl...se=167&slide=1. If so then you can type some codes to help it boot up. I would try the following:
Code:
knoppix vga=normal
Or
Code:
knoppix vga=normal screen=800x600 xvrefresh=60
Or
Code:
knoppix fb800x600
I hope this helps.
James