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We wiped our iMac and now need to reload the operating system. However, we do not have the start up disk for it.
iMac 21.5″, OS X 10.11
Use the Option Command R keys to install the latest compatible macOS.
Use the Option Command R keys to install the latest compatible macOS.
See if this works...
Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold ...
Command (⌘)-R
Installs the latest macOS that was installed on your Mac.
reloading operating system on iMac. I do not have the disc.
