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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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Will not power on after replacing cpu

Hello.. I recently attempted to replace the CPU and hard drive in my 27 inch late 2015 iMac (17,1). I replaced the cpu with a 6700k. I was careful not to touch the power supply coils. But regardless .. after reconnecting everything the power button does not turn on the computer. Of the 4 diagnostics LEDs , only the bottom led displays green when the power cord is connected to computer. When I press the power button nothing happens.. the fan does not move.. none of the diagnostic lights change. I was hoping it might be the psu so I replaced it with a new one from fixit.com but still getting nothing but a single green led on diagnostic board. I also tried removing and re-seating all memory sticks in iMac as well.

I would be grateful for any advice or suggestions.

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I would go back in and take the CPU out check the socket pins for damage as well as the chip. I’m suspecting you didn’t mount it properly, this is a common issue in the iMac’s as the heat sink makes it hard to properly align it and then the proper process of screwing the screws.

Think how you tighten the tire rims lug nuts. You criss-cross the tightening so the rim sits firmly and flat onto the hub.

Here we use the same approach! Slowly tightening the screws in the same pattern so the pressure on the chip is equal across. If not some pins won’t make contact, at worse the chip can be cracked!

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So that was exactly it... thank you so much!!! :) . Nothing appeared cracked, but I did have to slightly bend a few pins back into place, and power button now causes led 2 to light up !!! So now I know.. only 1 led could mean cpu is inappropriately seated.. and that you have to be extremely extremely careful when tightening the heatsink. It's a really weird design as the thermal paste will cause the cpu to stick to heatsink and move around with heatsink while you're trying to get it into place... This could all be avoided if the cpu block had a small retention arm to keep it in place.... I've built many PC computers over the years and this was the first time that I just felt dumb trying to tinker with my computer.

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