Hello! My iMac frozed and I had to switch the electricty supply off and on in order to start again the system, with the problem that the screen looks wierd, I tried to calibrate it... doesnt works any suggestion?

hello! My iMac frozed and I had to switch the electricty supply off and on in order to start again the system, with the problem that the screen looks wierd, I tried to calibrate it... doesnt works any suggestion?

Dear Paul, thank you very much for your time and answer, I followed those steps, somehow it helped the performance of my Imac, is faster now, but the screen issue about the very High contrast colours is still there. Since I am a photographer I am very depending on the screen calibration. I am worried that I came to damage the video card when I shut down the computer from the swicth when It was frozed.

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