Go through the operating system installation once again. OK, four more times. A cosmic ray of some kind interrupted the first install and it left things in a messy state that took a bit of hacking to clear up again before the installation could proceed normally. This has been quite a saga. And then there's the whole configuration thing and loading all my data (or trying to) once again. Think I'll just do a basic setup and let this thing hum for a while and find its zen again before trying to do anything else with it. On the bright side - I've made copious notes and all the details are still fresh so it should be a bit easier and faster this time around.