OWC Follow the online instructions (it's not difficult but you must know what you are doing). The computer would not start. On tried different ways (e.g. other slots). Nothing changed. I called Apple, they offered to reset the Apple the next day, try again with new RAM to let the computer get used to its original memory can (okay).After I put the Apple RAM back in, it booted with no problems and I installed all the usual software.The next day I tried installing the OWC RAM again."Again it didn't work. No doubt it is right there. Also, Apple told me it *should* work (it's stamped 2666 DDR4). However, it doesn't work. I'll go back and leave this tip to try and relieve you of the stress for about an hour.
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