the screen flashing / crazy

I have an iMac 27 inch mid-2011 and today all of a sudden the entire screen became a screen filled with small squares of different random colors.  At the same time flashing and changing colors.  I was able to restart the iMac and my screen looks ok, but I'm afraid that to happen and not recover.  I use OS X Yosemite 10.10.5.  No one knows what it is or how it can be fixed?  Thank you!

This looks like a faulty GPU, you can still get it fixed if you wish. Resume the computer at your local Apple store or CENTER in your area to be diagnosed professionally.

Good luck.

Tags: Mac

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