We can not get our knoppix 5.1 live cd to load on our hp 5800 pcs. The same cd works on other makes/models. The 5800s boots to the cd and the knoppix splash screen is displayed. We press enter and we see the loading progress. AFter that we see a blank screen. It should show the penguin in the upper left with information describing the boot process.

What can we do to troubleshoot?