Weird startup graphical glitch?

So I just upgraded my 27" iMac from Lion to Mountain Lion 10.8.4 last week and now every time I boot up my mac there's this weird rectangle graphic distortion that pops up right as the apple sign appears. After it loads everything is fine and I can use my mac normally. Im just curious what it is. It never happened before Mountain Lion. Any ideas?
Mac specs:
27" iMac
OSX: 10.8.4
Processor: 3.4 GHz intel core i7
memory: 12GB
graphics card: AMD Radeon HD 6970M 2048mb
Cheers
Ive been looking around and only found one post about it. But the problem wasnt resolved. Maybe Im just bad at searching.

BWareOfCleburne wrote:
For starters, here is what it looks like on my 21.5-inch, Mid 2011 with AMD Radeon HD 6770M 512 MB
Your photo is unviewable. You are making an accusation "There is an unknown graphic that appears after the apple startup screen." that implies every 2011 iMac has a GPU issue based on your experience alone. This is an extremely flawed assumption.

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