Manually restore files and apps to the newly-upgraded MacThis is time-consuming and can cause you a lot of stress and anxiety if you’re not used to doing things like erasing your drive. Use a bootable macOS Sierra installer drive to perform a clean installation Format the boot drive, which erases everything off of the Mac Manually back up important files and data on your Mac with Time Machine and another backup method Most people are fortunate enough to never see these problems, but others aren’t so lucky.Some issues people have run into include Wi-Fi dropping or being unusually slow, Macs booting to a black screen and getting stuck there, can’t shut down or reboot the Mac after upgrading, email issues, Spotlight issues, even individual apps that crash repeatedly.We suggest that you look for an easier solution than doing a clean install of macOS Sierra, but if all else fails, this will help fix many problems.Let’s get this on the table right now — a clean install isn’t something that a casual user might want to undertake. Think of it as taking a new Mac right out of the box, with no corrupted system files or any apps and data, and then installing what you need on the machine.Like most major operating system upgrades, the standard macOS Sierra upgrade has seen its share of odd issues.
Clean Full Manual File( Find out more about Time Machine here). Note that you will not use this Time Machine backup to restore your Mac – it’s just made as a last resort should all else fail.2) Make a full manual file backup. To see what the current backup status is, launch System Preferences, then click on the Time Machine icon. You might want to print out these instructions and then check off the steps as you go through the process, or have an iPhone or iPad pointed to this article while you’re doing the clean install.1) Make sure that your Mac has completed a full backup to Time Machine and has been making its incremental backup updates all along.Alternatively, you can use the Recovery Partition on your Mac. This can be done with a fast flash drive or an external disk drive. Last month, the Rocket Yard showed you how to do this with a free utility called DiskMaker X. Remember, any data that is not backed up will be lost during the erasure of your storage.3) Create a bootable macOS Sierra installer drive. Anything that lets you rebuild your Mac without bringing over old (possibly corrupted) settings files should be backed up. Mac os x 108 image for vmware downloadSelect the bootable macOS Sierra installer drive, then press the Return key to boot from the installer drive.6) The Mac boots into macOS Utilities (see image below), listing four options. As soon as you hear the boot chime (that pleasant musical tone you hear when you turn on your Mac), press and hold the Option key on your keyboard.5) Continue holding down the Option key until you see icons for your Mac boot drive and the bootable macOS Sierra installer drive. Personally, I think it’s a good idea to have the installer drive as a safety net if you need it.4) Attach the bootable macOS Sierra installer drive you just made to your Mac, and reboot the Mac. On the dialog that appears (see image above), you can either keep the name “Macintosh HD” or give your drive any name you wish. This is the drive that you wish to format and make the clean install onto.8) Click the Erase button. MacOS Utilities7) Select “Macintosh HD” or whatever you’ve named your Mac drive. There are no third-party apps, no photos, no music, no files, and there’s definitely no personal information or data on the Mac.From the macOS Sierra desktop, you can start moving your files, personal data, and apps back to the device from your manual backup. Once the installation is complete, the Mac boots into the clean install of macOS Sierra and begins the setup process.At this point, it’s as if you had just pulled that Mac out of a box and turned it on. MacOS Sierra will be installed on the Mac, which can take some time to complete. The following installer window appears:11) Select “Macintosh HD” or whatever you named the boot drive from the list of drives, then click Install. This returns you to the macOS Utilities screen.10) Select Install macOS Sierra from the menu, click Continue, and agree to the terms and conditions. If you do not have a backup, do not erase the drive!9) Once the drive erase and format are complete, quit Disk Utility.
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