Install / boot LEAP 42.3 on HP Proliant G4?


I am trying to update an older HP server from 13.2 to 42.3, but I can not boot the installation DVD (nor LEAP neither SLES 12). With “nomodeset” I get at least some text on the screen, but then there are repeating error messages with stack trace too big for the screen to read them completely.

Hardware is HP Prolient DL380 G4 with 8GB memory and 2 XEON processors. SCSI raid installed and working.

Since I am not very experienced with bootup trobleshooting I am asking for help here: What can I do to find the reason? Can I try some magic kernel parameters?

If some more information is needed, I will gladly supply it.