You should still have the hidden recovery partition. Are you sure you can’t get to it? You may need a USB keyboard if you have a Bluetooth keyboard. [https://support.apple.com/en-us/HT201314}About]
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You should still have the hidden recovery partition. Are you sure you can’t get to it? You may need a USB keyboard if you have a Bluetooth keyboard. [https://support.apple.com/en-us/HT201314|About macOS Recovery]
If you can’t get to it you’ll need to install macOS from the internet! [https://support.apple.com/en-us/HT204904|How to reinstall macOS from macOS Recovery]
Since you have a TimeMachine backup drive you can also try to boot up under it, with the drive connected, restart your system and press the '''Option (⌥)''' key that will get you to the Startup Manage so you can select the external as your boot drive [https://support.apple.com/en-us/HT201255|Mac startup key combinations]
You should still have the hidden recovery partition. Are you sure you can’t get to it? You may need a USB keyboard if you have a Bluetooth keyboard. [https://support.apple.com/en-us/HT201314}About]
If you can’t get to it you’ll need to install macOS from the internet! [https://support.apple.com/en-us/HT204904|How to reinstall macOS from macOS Recovery]
Since you have a TimeMachine backup drive you can also try to boot up under it, with the drive connected, restart your system and press the '''Option (⌥)''' key that will get you to the Startup Manage so you can select the external as your boot drive [https://support.apple.com/en-us/HT201255|Mac startup key combinations]