accidentally deleted Mac OS on iMac from 2012

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Level 1

17 points

accidentally deleted Mac OS on iMac from 2012

I was given a iMac from 2012 but they needed to delete all files off it while they were doing that they accident deleted the Macos as well because its high Sierra it says the installer resource has expired so I though lets install windows on the iMac but I'm not sure how to do that without the os is there anyway I can get the installer ( i have looked for a long time) or is there a way I can just install windows on it (Windows preferred option if available)

Posted on Mar 29, 2021 8:42 PM

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Answer 1

Top-ranking reply

Jack-19

Level 8

46,008 points

Mar 29, 2021 9:27 PM in response to lucian163

Hi lucian163,

Put macOS on it.

Shut down the Mac.
Turn on the Mac, and immediately press and hold Option + Command + R until you see a spinning globe.
Once you are in macOS Recovery, verify you are connected to WiFi in the top right corner.
Go to Disk Utility.
Select "View" in the toolbar > "Show All Devices".
Select your main hard drive. This will either be "APPLE SSD...", "APPLE HDD...", or "Fusion Drive".
Click Erase, and input the following exactly: (If you cannot select erase on the main hard drive, erase the "Container".)
Name: Macintosh HD
Format: APFS
Scheme: GUID Partition Map (if shown)
Click Erase
Quit Disk Utility
Go to the reinstall macOS app.
Follow the prompts, and install on Macintosh HD.

Cheers,

Jack

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