Install operating system

Question

Level 1

4 points

Install operating system

I have an old iMac which was under preforming so tried to reset to factory settings. By mistake I deleted the operating system and will now not boot. Other than my iPad and iPhone, these are my only Apple devices, therefore unable to download the operating system.

I do have a windows laptop but unable to download the operating still. Is there any way that I can access and install the operating system again?

iMac 21.5″, macOS 10.15

Posted on Apr 29, 2024 1:23 PM

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Answer 1

BDAqua

Level 10

239,885 points

Apr 29, 2024 1:45 PM in response to Buster734

Gulp, see if this helps...

Start up from macOS Recovery

Option-⌘-R

Upgrade to the latest macOS compatible with your Mac.

In Disk Utility>View, select Show all Devices, highlight the top left entry.

Run Disk First Aid on all items in the left panel, from top down.

APFS won't work for Sierra or earlier, Sierra or earlier needs MacOS Extended Journaled. High Sierra won't work for APFS on earlier Macs.

If all else fails...

https://mrmacintosh.com/how-to-fix-the-recovery-server-could-not-be-contacted-error-high-sierra-recovery-is-still-online-but-broken/

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