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Overview
In some cases it may be necessary to fully reinstall the operating system on a MacBook or other Mac computer.
Please note an internet connection is required; it cannot be done offline.
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Press the power button once, then press and hold the option (alt) + Command (⌘) + R keys.
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A new window will open up asking you for your WiFi. Please connect to your local WiFi network
Power on using the appropriate sequence. | Intel Macs (most CLICC lending Macs are Intel) Turn on your Mac and immediately press and hold Option-Command (⌘)-R until you see an Apple logo or other image. Apple Silicon Macs (some newer Macs) Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labeled Options, then click Continue. | |
| 3 | Connect to the internet | This can be an on-campus or home connection. |
| 4 | In the macOS Utilities window, click on Disk Utility |
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then Delete to confirm. |
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" and click Erase. |
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Then click on Erase. |
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| When finished, quit Disk Utility to return to the macOS Utilities window. | ||
| 9 | Select the Reinstall macOS option. |
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| 10 | In the following |
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Approximate install time is ~45 minutes.
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| 11 | Installation time can be around 1 hour. Once finished, the Mac will be in setup mode, and you can continue setting it up by following the prompts. |
