Well, I tried "Damn Small Linux" to boot from a live-CD and this one is able to boot but with a special cheat-code. I have to write "dsl nousb xsetup". Normally you have to write "dsl xsetup". With nousb i can change Xvesa to Xfbdev. I think the graphic board is too old but i cannot find a special code to change Xvesa. Do you have an idea?