I think that your motherboard was manufactured by Asus and has got a Geforce 7025 grapics card. On the web page http://www.knopper.net/knoppix/knoppix64-en.html Klaus Knopper suggests that one should try
Code:
knoppix nomodeset xmodule=nv
at the boot prompt if an NVidia graphics adapter does not work with the nouveau graphics driver.