Same for probleme for me : After a correct boot, I have the Gnome Wallpaper and sometime and exactly like andrewsomething : X seems to load fine, the Gnome wallpaper appears, and then it waits. Occasionally, it will drop out to a black screen and flash some errors before repeating the process again. This is impossible to make a ctrl+alt+fx to see logs or others errors.
Same for probleme for me : After a correct boot, I have the Gnome Wallpaper and sometime and exactly like andrewsomething : X seems to load fine, the Gnome wallpaper appears, and then it waits. Occasionally, it will drop out to a black screen and flash some errors before repeating the process again. This is impossible to make a ctrl+alt+fx to see logs or others errors.