Screen gone black/blue with spots of color throughout.

I don't understand it. When I start up my computer, it looks all normal colors, then it just switches to a blackish/blue tint, with spots of green red on my desktop picture. My text is in white (which its set for blue). I have tried calibrating it, checked all through system preferences. Tried a few different techniques duting start up that I've read from other computers having bue tints, but nothing has worked! My extended warranty just expired 2 weeks ago. i have had the computer 3 yrs, and never had this problem before?? Help!!

Hello,
I have had the problem, that the grafic would shift after a time of 1-2 hours using the computer. I rec. that this would a temp. problem. Because dust inside the computer reduced the effect of cooling and the temp of the grafic card would be too high.
I tried to put some sticks under the computer to give the cooling around and spec from the bottom plate, more effect. This helps. But this should not be a result for the future, only for a moment. If this helps your comp. you have to clean him inside. This is better with assistance by an expert, because the i-mac is not so easy to clean like a tower.
Kind regards

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