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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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Help me troubleshoot my iMac.

I replaced thermal paste, replaced the HDD with a SDD, and cleaned out the fans and case. No accidents, all connections accounted for. Now, absolute silence and no picture when power button is pushed. I've re-opened twice after going to google and to apple support and I can't find anything wrong.

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I'm afraid this did not help. I have purchased a replacement power supply from eBay. I have some compatible SODIMMS which will replace the current ones. I 'm arranging for someone to help me check the power switch ( this is a stretch, I know). If this doesn't work, I'm done, and I will part it out and sell it. Thank you for your help.

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You likely didn’t sit the CPU chip into the socket correctly. The design Apple went with is a bit tricky! Go back removing the heatsink and inspect the chip and the socket for damage if you are lucky, reseat the chip but soften the springs a bit.

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I'll let you know. I'm grateful.

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todoroffc will be eternally grateful.
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