I managed to get the system working. Since the Fast Data errormessage could be a bad CPU, I tried reseating the CPU, which took care of that errormessage. Still didn't boot, though. Another guy here tried the cd-rom drive again and when he did a probe-scsi-all, he noticed that it was showing an ID of 3 instead of 6. So it seems like the ID-jumpers were swapped between the cd-rom and the dvd-rom... So in the end it turned out to be a bad dvd-rom drive and possibly a CPU that needed to be reseated. Thanks for all the help!

Stig