Graphic glitch at boot since installing ML. Any clue why?

Since installing Mountain Lion on my late 2011 MBP I have been experiencing graphic glitches every once and a while.
The one thing that has stayed consistent is the glitch when I boot up. I get big square blocks that come up as I boot. (Pictured above)
Anyone have any idea why my mac would do that? Could it be a hardware problem?

I shut down my Mac overnight and it as I booted today no graphic glitch occured, tried 3 times to see if it would come back and nothing so far. I've never had any issues with overheating and I keep track of it pretty well with iStat Pro. Last night when it was doing it, the temp was around 170 after booting.
I'm going to try to play a game or something to push the temp up a bit and reboot again. I'll update in a few and let you know if thats the prob. I've been running an FC but I've left it at the default 2000 rpm, I'm not sure how that would affect it because it haven't been that hot to begin with.
Thanks for all the advice.
I'm thinking maybe I better make a stop at an Apple store and see what it says before college starts back up and I don't have my mac.

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Graphic glitch at boot since installing ML. Any clue why?

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