I know it's a bit late, but here goes.
You need to start gedit as root.
Open gnome-terminal and type
From gedit, browse to and open /etc/default/grub and look for a line that reads
and change it to read
Then save your changes and close gedit.
Now, go back to the command line in your terminal and type
Your splash screen will seem screwed but your graphics won't go wonky.