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Current version by: Dan ,

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-No Linux or Windows commands. All you have are the Startup commands which work across as they are all based within the EFI (BIOS) [https://support.apple.com/en-us/HT201255|Mac startup key combinations]
+No Linux or Windows commands. All you have are the Startup commands which work across all OS’s as they are all based within the EFI (BIOS) [https://support.apple.com/en-us/HT201255|Mac startup key combinations]
I think you’ll need to test the system using an external MacOS bootable drive. Do you have access to a second Mac to use to create it?
I would recommend you setup a bootable Sierra drive. Download this OS installer [https://support.apple.com/en-us/HT208202|How to upgrade to macOS Sierra] Jump down to Step 4, click on the Blue '''Download macOS Sierra''' URL link to get the needed file. The reason you want this one than what you may already have has to to to an expired certificate issue Apple created [https://appleinsider.com/articles/19/10/24/if-youve-got-an-old-macos-install-image-it-will-probably-stop-working-today|If you've got an old macOS install image, it will probably stop working today]
Using your other Mac format a USB thumb drive with GUID Journaled file system, then launch the installer to prep the drive with the OS, When done, copy over the installer onto it so you have it when you use it to boot up your system.
Reference the “Mac startup key combinations” for the commands. Here we’ll use the '''Option (⌥)''' key to gain access to the Startup Manager so we can select the external drive.

Status:

open

Original post by: Dan ,

Text:

No Linux or Windows commands. All you have are the Startup commands which work across as they are all based within the EFI (BIOS) [https://support.apple.com/en-us/HT201255|Mac startup key combinations]

I think you’ll need to test the system using an external MacOS bootable drive. Do you have access to a second Mac to use to create it?

I would recommend you setup a bootable Sierra drive. Download this OS installer [https://support.apple.com/en-us/HT208202|How to upgrade to macOS Sierra] Jump down to Step 4, click on the Blue '''Download macOS Sierra''' URL link to get the needed file. The reason you want this one than what you may already have has to to to an expired certificate issue Apple created [https://appleinsider.com/articles/19/10/24/if-youve-got-an-old-macos-install-image-it-will-probably-stop-working-today|If you've got an old macOS install image, it will probably stop working today]

Using your other Mac format a USB thumb drive with GUID Journaled file system, then launch the installer to prep the drive with the OS, When done, copy over the installer onto it so you have it when you  use it to boot up your system.

Reference the “Mac startup key combinations” for the commands. Here we’ll use the '''Option (⌥)''' key to gain access to the Startup Manager so we can select the external drive.

Status:

open