It is that time again. Time to decide whether to keep or replace your Mac laptop or desktop computer. If you are reading this article, chances are you've already come to the decision to replace your Mac with the iMac Pro (or maybe you just got a new Mac as a present!), and you're thinking about selling your old model.
The best Mac hard drives for 2018 Here are the best Mac hard drives and external storage options for your Mac in 2018. Find out which Mac hard drive can help you increase your Mac's storage. Should you intend to make an OS X installer drive (for OS X Mavericks, OS X El Capitan, OS X Yosemite, etc) or create any other bootable Mac OS X volume from a drive, or use a new drive as a fully compatible Time Machine backup drive, you will also need to complete this process.
The first thing you should do before hitting the streets to sell your old Mac is clear it of any and all personal data. You don't want to accidentally sell your computer to a stranger when you are still logged into iCloud.
If you already have your new Mac on hand, you can transfer all of your data from your old Mac or use an older Time Machine backup. If you don't have your new Mac yet, well ... then you probably shouldn't be selling your old one yet. But, if you really don't think you'll need your old computer before getting your new one, just make sure to back up your data so that nothing happens to it before you get what you need onto your new Mac.
The software you have on your Mac is licensed to you, which means it doesn't get transferred to the new owner of your computer (except the operating system). In order to avoid complications with the new owner attempting to download and install software that is licensed by you, make sure to sign out of everything your personal information is connected to.
Click on Sign Out.
Click on Sign Out.
Click on iCloud.
Click Remove data from this Mac when prompted.
Once your data is backed up and you've signed out of everything that might connect your old Mac to your personal information, you can erase everything on it by reformatting the hard drive.
Click on Continue.
Click on Erase from the buttons at the top of the Disk Utility window.
Click Erase.
After the process is complete, select Quit Disk Utility from the Disk Utility drop-down menu in the upper left corner of the screen.
After you reformat your hard drive it will be ready for a clean installation of the operating system. You should already be in the Utilities window after erasing your Mac. If not, restart your computer and hold down Command and R at the same time until you see the Apple logo.
Make sure to reinstall macOS through Recovery Mode, holding down Command+R. This ensures that you can install macOS or OS X without having to sign in with your Apple ID.
If you get stuck during reinstallation, see our troubleshooting section for additional help.
Note: Make sure your Mac is connected to the internet in order to verify the software. You'll be asked to do so during the installation process.
If, while reinstalling macOS, you're asked to enter a password, enter the password you use to unlock your Mac, not your Apple ID.
Click on Install to install the latest operating system that was on your Mac. Your Mac will restart after the installation is complete.
Click Shut Down to shut down your Mac.
Your Mac is now clean and ready for a new owner. They will complete the setup instructions to get started using the Mac, as well as download the latest macOS operating system that is available and supported on their Mac.
If you follow the steps above, the information stored in the Touch Bar of your MacBook Pro will be securely erased. However, if you've decided to use a third-party program or used Target Disk mode to erase your Mac, you should follow these additional steps to ensure that your Touch Bar data is also erased.
Enter the following command into the Terminal window:
xartutil --erase-all
This will clear all the information from your Touch Bar.
I've gotten a lot of very specific questions about issues some readers have with erasing or reinstalling macOS (usually reinstalling). Sometimes, the easiest way to fix issues with reinstalling macOS is to start by holding Option+Command+R which will put your Mac into an alternate version of Recovery Mode that allows you to install the original macOS that came with your Mac. From here, you can either keep that operating system and let the new owner update to their preferred macOS, or go through the macOS update process.
If, during the macOS reinstallation process, the installer doesn't see your disk or says you can't install the operating system on the disk, you may need to try erasing your hard drive again. Restart your Mac and hold down Command+R to bring up Recovery mode and repeat Step 3.'
Since macOS changed to APFS, some readers have struggled with which format option to choose when erasing their disk. Here are some other possible troubleshooting issues from Apple's support document that may help you.
If the built-in disk came APFS-formatted, don't change it to Mac OS Extended.
If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended (Journaled). During installation, the macOS installer decides whether to automatically convert to APFS—without erasing your files:
Choose Mac OS Extended (Journaled) for any disk that you plan to use with Time Machine or as a bootable installer.
If the other Mac isn't using High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't mount APFS-formatted volumes.
To learn which format is currently in use, use any of these methods:
If you're still having trouble with either erasing your hard drive or reinstalling macOS, please reach out to us in the forums. We have a wonderful community of Apple users that are happy to help someone in need.
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Is there anything about resetting your Mac to prepare it for sale that you need help with? Let me know in the comments and I'll get you squared away.
Updated May 2019: Added additional information about the Mac.
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