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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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iMac 27" 2017 RAM upgrade to 24 GB but won't power up!

My current RAM is two 4 GB modules (2x4) by default - total of 8 GB

I bought the same frequency two 8 GB modules (2x8) PC4-2400 to get the total of 24 GB

Now its not powering up.

If I removed one of them, and leave 3 modules it’s OK, but I only get to 20GB. If I add the last 4 GB module it will not power up.

Any Idea or solution for this?

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You need to wait a bit for the system to initialize the RAM as you’ve altered it “Your iMac performs a memory initialization procedure when you first turn it on after upgrading memory or rearranging DIMMs. This process can take 30 seconds or more, and the display of your iMac remains dark until it's finished. Make sure to let the memory initialization complete.” Installing memory in 2017 iMac.

Have you tried moving the modules around? You might have a bad module slot. Just using the two 8 GB modules place them at the top slots.

Reference: Apple - Install memory in an iMac guide

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Thank you Dan, Ill give a try later and keep you posted.

Appreciate your quick response. :-)

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Alexander Legrama will be eternally grateful.
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