Why does iMac show after boot white screen

Hi, the iMac is about a year old and showed suddenly a problem with the screen. It turned blue and it disapeared only by pulling out the power cord.
Today, the restart stops after the apple logo and ends in a white screen. Shutdown is posible by the power switch - holding three seconds.
It is not a problem of a harddrive, because i could see the recovery drive. However starting the recovery drive did show the same steps ending in a white screen.
What is the problem? I think it is a failure if the grafic card?

iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program

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I hope more people who have the same problem post something here, to let Apple now that they have to do someting about it!
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Why does iMac show after boot white screen

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