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Check the serial number on the ram. Install the ram in order of serial numbers. It may be that they have to be matched. This worked for me on my Hackintosh. 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 ...


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The 2019 iMac computer have different memory specifications depending on which model you get - the 21" and 27"; the 4K or 5K models. Not all models support 128GB of RAM. It's also important to note that OWC is not the original memory. OWC is an after market brand. If you're positive all of your memory works, but when you install the rest you get ...


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Contrary to what you might think - macOS is actually not wasting RAM in this case. As I see in your comments, you seem to be using an equation like this: used ram = app memory + wired + cached and you're using the term "used ram" as if it means "spent ram" or something like that. That's actually not the case. If you want to look at "...


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Memory is meant to be used fully then, only later once you have a “problem” does the OS optimize and compress based on pressure. Everything looks excellent, as designed and well in order in your examples. Even if you have some memory swapped, that’s no performance issue in practice. Only after excessive swapping and sustained memory pressure would any any ...


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The above are great answers. I'm adding this because people coming here who are running Catalina need some additional steps found online but with some effort. With Catalina parts of the system have become readonly even for root, so a couple of extra steps are needed. The steps are to Disable SIP, remount /, killall Finder, turn off and rename spindump and ...


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As long as all the modules are of the same specification, then there should be no problem, as that's exactly what the spec is there to ensure.


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Anyone might know that this solution would be helpful. Try holding down the C key at startup to start from a bootable CD or DVD.


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