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How to replace the main logic board in an iMac with retina display

Replacing the Fusion Drive with both a SSD and an harddisk

July 30, 2020 -

This month I did an attempt to upgrade my 27-inch iMac 5K. I wanted to replace the fusion drive with a SSD and a large hardisk. In addition I decided this was a good time to upgrade the RAM memory as well, maxing it out at 64GB. I was on a mission to create the ultimate iMac, but things didn't go to plan!

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After installing the new RAM, I powered on my iMac to see if the new modules worked - they did!
After installing the new RAM, I powered on my iMac to see if the new modules worked - they did!
YES, it works! The new logic board accepted keyboard input and allowed me to proceed with macOS installation
YES, it works! The new logic board accepted keyboard input and allowed me to proceed with macOS installation
Migrating the RAM modules to the new logic board
Migrating the RAM modules to the new logic board
iMac in trouble: no system drive found
iMac in trouble: no system drive found
Double, tripple, quadruple checking the PCIe SSD drive
Double, tripple, quadruple checking the PCIe SSD drive
Many hours later, the iMac was working again!
Many hours later, the iMac was working again!

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