So my Macbook died

Right, so, in the middle of merging a branch in subversion, which in itself is daunting enough, all of a sudden I get the dreaded “bezel of death” on my screen. The computer reboots and by the time I get to login, it tosses me out. “Filevault is broken,” it says. There’s a repair button, but that doesn’t do anything. It just comes up and tells me that I can’t log in at this time. This time I only get an “OK” button, which merely discards the dialog and leaves me sitting there. That last dialog also has that standard “Xcode no-icon-has-been-set” icon, which probably indicates that this is not supposed to happen. Well, I fixed it in the end. Read on for instructions if you care, lest this happens to you.
