You can also boot off that disk, reformat your Mac's hard drive, and reinstall. If you have it, that's a bonus for some buyers, so make sure to keep it safe. Depending on its age, it may have come with a boot disk. Next, you'll need to restore your Mac to factory condition. Select Keep Copy and follow the additional directions. You need to sign out of your iCloud account. Click Messages in the menu bar on the top left of your screen.Launch Messages from your Dock or the Finder.Sign out of Messages before selling your Mac to someone. Yes, you're going to factory reset your Mac, but you can never be too careful. Click Account in the menu bar on the top left of your screen.
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