It's not really too late, Shorty. I haven't done anything irreversible to the old machine so I might still fiddle with it. Once I have copied all the stuff I want from its hard drive I could put that drive back in the old machine and keep trying things to see if I can get it running again.
After all, it's still one heck of a machine. Assuming that I can get the new machine going and configured the way I want, I could use the old machine as the guinea pig that I have been daydreaming about for a long time. I could install the whole game with all the expansion packs without worrying about messing up my little universe.