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The Mac boots off of the High Sierra installer into the macOS Utilities screen (image below is from a photograph of an actual Mac display): macOS Utilities, with Disk Utility highlightedД¬lick Continue to proceed to Disk Utility. While theВ image above shows the MacвЂ™s boot drive вЂњMacintosh HDвЂќ as selected for boot, we do not want to use that drive instead, use the arrow keys or your trackpad to point the cursor at вЂњInstall macOS High SierraвЂќ, then press Return. It looks something like this: macOS Startup Manager, showing all internal and external drives Reboot your Mac, and hold down the Option/Alt key on the keyboard until the macOS Startup Manager Screen appears. Make sure that the bootable macOS High Sierra installer you just created is connectedВ to your Mac, whether itвЂ™s a USB flash drive or an external hard disk.

Step 3: Erase and Reformat the MacвЂ™s Boot Drive When youвЂ™re done with steps 1 and 2, you can proceed to the scary part - erasingВ and reformattingВ your MacвЂ™s boot drive. We just published a step-by-step process for creating your bootable macOS High Sierra installer using this free application, so take time to read the process and to make your installer disk However, thereвЂ™s an easy way to do this step, and thatвЂ™s to use DiskMaker X 7.

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You can create a bootable macOS High Sierra install disk by knowing just what Terminal commands to use. Step 2: Create a Bootable macOS High Sierra Installer

Remember, your Mac will be completely erased and if you have not copied your information to another location, you will lose it. Now, what kind of backup to you want to do? A Time Machine backup of your entire system is quite acceptable, or you can use an app like Carbon Copy Cloner or SuperDuper! to create a bootable clone of your Mac.ДЇor those really important files, such as important documents, photos, videos, and so on, you may want to make a separate backup onto other media or to a cloud service like iCloud Drive or Dropbox.Дo NOT go further without making aВ backup.

#Apple store mac cleaner free for mac

ItвЂ™s very useful to also have copies of all of your license information for Mac apps, since those that require a license or activation will need to be set up after your clean install.

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In addition, be sure that you know all of your online account passwords and logins - for this, a password manager like 1Password can be very useful. Make sure that you have access to all installation media for your apps (developer websites,В Mac App Store, DVD or CD), and itвЂ™s a good idea to make a Note of all apps that you wish to re-install.

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Clean installs are also useful if a software or system software update has somehow trashed your existing operating system or if you have replaced a hard drive.Д«e sure you have plenty of time available to complete the complete install, as it can sometimes take as much as a day to go through all the steps.ДЄs noted, weвЂ™re going to completely erase everything on the Mac. In many cases, a clean install can improve the performance of a sluggish Mac. The idea behind a clean install is to start with a completely bare machine, getting rid of any old data, files, preferences, settings, old drivers, apps you no longer use, and so on.

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In this post, weвЂ™ll describe how to do a clean install of macOS 10.13 High Sierra.Д«efore we get started, make a decision as to whether you want to do a regular update or a clean install, because a regular update is much easier to perform than a clean install. WhatвЂ™s a clean install? That means that the hard drive is erased completelyВ and reformatted, which removes not only the current Mac operating system but all data, files, applications, you name itвЂ¦ Just think of it as a brand new computer having the operating system installed on it for the first time. Thanks again.Sometimes itвЂ™s a good idea to do a clean install of a new Mac operating system version. Well, you're getting mine within seconds.

I'll never know which settings had been causing the problems, but using the DEFAULT command brought my iMac back to its brand new condition. I just saw a command that said something like 'Restore all defaults,' so I chose it thinking that it could do no harm. Even better, Onyx fixed the problems even though I had no idea of how to use it. They couldn't help me, either so, having nowhere else to go, I tried Onyx, and not only did those two problems disappear, but also another one that I had resigned myself to. I had had a couple of problems that they couldn't help me with, so I called Apple Care. Anyway, I used Onyx WITHOUT THEIR PERMISSION, and it worked. I had assumed that Apple Support Communities would be against Onyx, because they are against everything that doesn't come from Apple, and they like to argue too much for my taste.