Step 1: Restart your Mac.While the startup disc is waking up, hold down the Command+R keys simultaneously. After the process is complete, select Quit Disk Utility from the Disk Utility drop-down menu in the upper left corner of the screen.Īfter you reformat your hard drive it will be ready for a clean installation of the operating system. See Troubleshooting for more information on which format to select.If Scheme is available, select GUID Partition Map.

If your Mac is using APFS, select APFS from the format list. Step 4: Click on Erase from the buttons at the top of the Disk Utility window.Step 5: Enter a name for the file to be destroyed (Like Macintosh HD or something).If your Mac is using HFS+, select Mac OS Extended (Journaled) from the format list. Step 2: Select Disk Utility and click on Continue.Step 3: Click on View.Click on Show all Devices.Select your Startup disk (it is probably named 'Apple SSD' or something similar). You're Mac will boot into macOS Recovery mode. You just have to reformat your hard drive and reinstall a clean version of the operating system.

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