What to Do If Your Mac (macOS High Sierra) Installation Stuck/Frozen/Slow

Posted by Winnie to Mac, Apple Resources | Posted on Oct 9, 2017

Have you ever met the situation that your Mac installation stuck/frozen or slow when you're upgrading to macOS High Sierra, Sierra etc. Specifically, your Mac install stuck on Apple logo with a status bar showing the progress as the software is loading; Mac update stuck on gray screen, white or black screen; or your macOS update is extremely slow. What to do if your macOS High Sierra installation get stuck, frozen or extremely slow? Here we'd like share you some tips to fix Mac installation stuck problem.

Lest Mac Installation Stuck, Backup Your Mac in Advance

Given that your macOS installation stuck or frozen on the half way, you need to forcibly reboot the Mac which will interrupt the installation process and potentially cause you to lose data. So utilize MacX MediaTrans to back up photos, videos, music, ringtone, ebook, etc on your Mac before you install new macOS High Sierra.

  • Photo
  • Music
  • Video
  • iBook
  • Ringtone
  • Flash Drive

Make Sure Your Mac Installation Got Stuck/Frozen Really

At the very beginning you need to check whether your macOS update get stuck because the macOS upgrade can take a very long time. Usually several hours are needed, but there are exceptions as well. Sometimes update can take 16 hours or more. So it's quite essential to see the Log to make sure whether your Mac is still installing macOS High Sierra.

Just press Command + L, you can see the detailed remaining time of the whole Mac installation, what files have been installed, what files will be installed next and the amount of time left. If the Log screen shows that nothing is happening, your Mac installation stuck/frozen indeed.

Tip & Tricks to Fix Mac Installation Stuck/Frozen/Slow Errors

If your Mac really freeze on installing, you can try to fix it with the following tips. There is no guarantee that each tip works on macOS High Sierra update problems. But it covers the common measures when Mac users fails to install new macOS, hopefully any of these tips will work for your macOS installation frozen problem.

1. Shut down, wait a few seconds and restart your Mac. Press and hold the power button to shut down and start your Mac back up.

2. Go to Mac App Store and open updates. If your Mac install stuck on Apple logo, gray/white/black screen when you were installing an App, you can go to Mac App Store to find this app and open the updates to survive from the macOS installation stuck situation.

3. Download & install the combo update. The Mac App Store isn't the only place to download macOS from. When your encounter problems on macOS High Sierra or macOS Sierra installing, you can try to download the combo macOS update from the Apple official site because the macOS installation package downloaded from Mac App Store may only include the essential files for your Mac update, instead of the combo updater with all the files required to update to macOS.

mac-installation stuck

4. Install in Safe Mode. Safe mode (also called safe boot) is a way to start up your Mac so that it performs certain checks and prevents some software from automatically loading or opening. When your Mac installation stuck or Mac runs slow when High Sierra installing, you can install in Safe Mode so that you're able to resolve issues that might keep your Mac from completely starting up, or to isolate other issues related to your startup disk. Simply press the power button and hold down the Shift key to start the Mac up in Safe Mode. Open App Store and update your apps while in Safe mode. Reboot.

mac installation frozen

5. Clear Mac Storage Space. If your Mac doesn't have enough space, the macOS High Sierra installation can be stuck or slow as well. So before High Sierra installation, you should free up your Mac space to solve the Mac installation stuck problem. There are many tools to make this done, and MacX MediaTrans absolutely deliver the double benefit of clear Mac space and make a backup of your significant files.

macos installation slow

6. Reinstall macOS with Recovery Mode also works for Mac installation frozen error. But to be frank, it's the least option, since there is a possibility to loss your Mac data. To adopt this solution, you can hold down Command + R at start up. Then recover your Mac from last Time Machine backup, or from iTunes and iCloud backup.

7. Install macOS from the External Hard Drive. Well, if you're still having issues with the install you could try installing the OS from an external drive. This sounds unpractical, right? But if you actually install macOS High Sierra on an external drive, flash drive, or SD card, you can use the external hard drive for Mac as the macOS system disk wherever you go. To make this done, you need an external storage device with a minimum capacity of at least 16 GB (though the larger the better) and a copy of the macOS High Sierra installer.

Finally, when you get the macOS High Sierra installed, we advise that you run Disk Utility to correct any issues that might have caused the problem in the first place. Simply, click on the Finder Icon from the dock; locate and click to open Applications within the left pane of the Finder window; scroll to the bottom of the Applications window to locate and click to and open Utilities and locate and click to open Disk Utility.

Make A Backup of Your Mac with MacX MediaTrans!

MacX MediaTrans, an awesome data transfer tool between Mac and iOS, allowing you to transfer significant Mac files, like video, 4k photos, music files, videos, ringtone etc. so as to make a backup of Mac data and free up more space on MacBook Pro/Air, iMac etc.

Related Articles and Tips

How to Upgrade to macOS High Sierra

Guide you to upgrade to macOS High Sierra without Problems

macOS High Sierra Problems and Solutions 

Fix Common Issues about macOS High Sierra Update

Best External Hard Drives for Mac

A list of the best External Hard Drives for Mac

Must-have Apps for New Mac in 2017

A collection of the best Mac apps 2017

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