IMac Feezes with Pink/Green Pixel Boxes

My mid-2010 iMac freezes after random strips of green and pink pixel boxes appear on the screen (see image below). Has anyone else experienced this and managed to fix it?

What machine did you recently update to Yosemite? Are you also on a mid-2010 iMac or something else?
I went to Yosemite right when it was released and I can't remember if I had this problem before then. It would be nice if it was just some weird and easily fixable software issue and not a larger hardware issue.

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