Let's hope it means "in the United States of America" and not some town in a faraway land named "usa" that they've chose to capitalize the letters.
Even if the system is out of warranty, I'd still recommend giving Apple a call (or if you're near an Apple Store, schedule an appointment at the Genuis Bar) and see what the outcome is. I've heard of many stories, and had some experiences myself of Apple repairing stuff for free or very little cost on out-of-warranty machines.
One last tip, if you do bring the machine in, have your girlfriend explain simply and honestly what has happened to her Mac Pro. Your sarcasm in your post makes me think she'd draw more sympathy than you.
That being said, I recommend taking a few minutes to listen to the "This American Life" episode where a mother dying of a terminal disease left letters for her young daughter to be read annually. From the story's description, "At first the letters were comforting, but as time went on, they had much more complicated effects."
You can stream the episode from http://www.thisamericanlife.org/radio-archives/episode/401/parent-trap (I'm recommending the "Letter Day Saint" act 1 story).
I believe his name is "Drew Curtis" - note the terminal "S".
Is that you, PGURRIERI?
(I can't believe I'm burning my ability to mod to post this)
That one seems to have entered the popular lexicon.
Just like John Fogerty was sued for writing songs that sounded too much like songs written by...John Fogerty
How about this: Violence begets violence, and therefore you shouldn't perpetuate the cycle?
Or, would you rather that your child is beaten by their spouse, regardless of how successful they become? Oh, wait, in your mind, it's easier to for them to be the one doing the smackin' around...