* It is a Nvidia GeForce GT 640 based graphics card
* The live CD does not use grub.
* Debian/wheezy based system with extra kernels installed from Debian backports.
* The dog barking does not make any difference what so ever.
... humble suggestion that you revisit that influence...
Wife and I recently uncovered a hacker plot in our own house.
Our seemingly faithful pugalier (codename "chunky munky") and older hairy canine (codename "Kung foo doog") were recently caught redhanded in a hacking attempt designed to plunder our family savings...thankfully our meta-data project caught them before it was too late.
....That goo eyed look you get from your dog when you rub its belly with your foot?
Its not love... its evil intent.
Suggest:
Getting a friend to take the dog for a long walk THEN debug as before.