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1.8GHz dual-core Intel Core i5 (Turbo Boost up to 2.8GHz) with 3MB shared L3 cache

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MacBook Air A1466 reinstalling OS X Mountain Lion help

Hi all

Need advice on help reinstalling OS X Mountain Lion, I had to replace the motherboard on my Macbook Air but get to the point of reinstalling but stuck on the page where it says “select the disk where you want to install OS X” as it dose not show me anything, please see picture attached, any help would be appreciated.

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Update (11/24/2021)

This is all I get and when I click on disk utility’select all’ is greyed out

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FYI - Your system can support a newer OS release you can go upto Mojave 10.14.x without any problems, I would stick with that. You can directly download it from here How to get old versions of macOS and if you have a 32GB USB thumb drive you can create a bootable OS installer to save time and have as a backup! First format the drive to GUID and a Journaled file system, then follow this guide How to create a bootable macOS Mojave installer drive


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Did you reformat the hard drive before running the installer?

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Not sure how to do that are you able to help please



1. Shut down your Mac.

2. Press the power button, then immediately start holding Command+R.

3. Keep holding Command+R until you see a window that says "MacOS Utilities".

4. Double-Click on "Disk Utility"

5. In the Disk Utility window, click View>Show All Devices.

6. Select your Disk and click Erase or Format.

7. Format the disk as MacOS Extended(Journaled).

8. Shut down your computer.


Hi this is all I get, and show all in utilities is greyed out.


@burnsclan On that screen, select "121.33 GB Apple SSD..." and click erase or format(you might need to mount/unmount the drive). Choose MacOS Extended as the format. After that, click "enable journaling" if it's not greyed out.


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colin será eternamente grato(a).
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