Well, my desktop at work booted up this morning, but I suspect not all is well. One of the hard drives is making an annoying high pitched whining sound, which wasn't happening before I left. A check of the system log shows it's been rebooting almost daily since I left for some odd reason that's not indicated in the log file. Backing up my home directory now onto what is hopefully the good drive and not the whining one. Hopefully the whole 11GB of my home directory can be backed up before another shutdown occurs.
Still not sure what caused yesterday's meltdown, but I suspect something's overheating in the case.