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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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iMac cannot power up

I have good power supply and good source but all the 1,2,3,4 LED diagnose light off, what could be the problem? thanks

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I have the same problem, with the Late 2015 model. I replaced my CPU and got this problem to occur. I am hoping its the PSU, I have a new one on the way for wednesday.

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Review this answer - iMac non-responsive... Bad PSU?

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