After last night's kernel upgrade I'm getting the following symptoms:
After restarting computer several times.
One of my screens (always the same one) is split down the middle. Not always in the same place, and sometimes shows "trails".
Unity desktop half-loads and then doesn't respond to any command. The mouse moves but nothing is clickable.
Xmonad desktop responds (I'm on Xmonad desktop right now, using the second screen).
During one of my boots, Ubuntu brought up the Grub menu. I chose "ubuntu" option and suddenly everything worked fine. I restarted the computer again, and everything is screwy again.
I've tried to bring up the Grub menu again, but pressing shift during boot process makes my computer shut off instantly and restart.
How do I revert the damage caused by the dist-upgrade?