White screen with green stripes

Hi,
            I have an imac 27” (Mid 2011), My screen started to freeze 30 minutes after I turned the computer on. I would be running lightroom 4 or some other program, and suddenly the screen would go black with some stripes (just like old TV did when you turned them on), then it would go to a complete White screen an that was it. If I restarted it would have the problem 30 min after. This happen sevral times during the last days. Yesterday , I started the computer and a White screen with a  Apple symbol  appeared and after that it jsut went white . Some some vertical Green lines appeared. Then the screen when back total white and nothing happens. Could this be lack of memory space? Any suggestions?

It reads as if you have a hardware problem which we here can't solve. Bring the Mac into an Apple Store or AASP.

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