I was running 7.0 for 8 months with never a hitch on booting.
Recently every now and then on booting I would get a blank screen instead of teh login screen. Sometimes I could recover by switching to a console(f1-6) and back to the gui(F7). Or I could just type in my name and password and the desktop would appear.
I upgraded to Hardy Heron and now its happening much more often and sometimes there is no recovery except a power cycle.
Sometimes the same thing happens when the screen saver turns on. I don;t hibernate the machine ever.
I'm running on a Latitude 820.
Any clue as to whats going on?