再起動できなくなったHDをmountして/var/log/Xorg.0.logをみましたら最後は (II) Mouse0: ps2EnableDataReporting: succeeded Could not init font path element /usr/X11R6/lib/X11/fonts/Speedo/, removing from list! Could not init font path element /usr/X11R6/lib/X11/fonts/100dpi:unscaled, removing from list! Could not init font path element /usr/X11R6/lib/X11/fonts/100dpi, removing from list! Could not init font path element unix/:7100, removing from list! となっていました
