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have got the procedures for up grading my late 2015 21.5 to ssd but not sure how to install / set up the operating system....
Installing new ssd (upgrade )
- Thread starter dennisfcampbell
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If you have an OS installer for the iMac then you can plug it into the iMac and startup while holding the Command and R keys
If you don't have the installer, you can startup the iMac while holding down the Command, Option and R keys. This will log into Apple's servers and should allow you to install macOS Monterey.
If you don't have the installer, you can startup the iMac while holding down the Command, Option and R keys. This will log into Apple's servers and should allow you to install macOS Monterey.