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I am unable to locate the HD disk location to reinstall Mac OS. How can I do this? Late 2015 27" iMac 5K
You can also use How to create a bootable installer for macOS - Apple Support
Sounds like either the HDD has failed or was not erased and formatted properly.
see > Use Disk Utility to erase an Intel-based Mac - Apple Support
If I have lost my startup disk, how do I reinstall Mac OS? I have no selection for disk location to load file to
