You’re here to fix macOS High Sierra problems and we have solutions that will solve many bugs, issues and even frustrating features in the latest version of macOS.
Instead of making an appointment with an Apple Genius, you can use this guide to fix common macOS High Sierra problems on your MacBook, MacBook Air, MacBook Pro, iMac and Mac Mini.
Apple released a Supplemental update for macOS High Sierra that improves installing, fixes a cursor problem in Adobe InDesign and fixes email problems with Yahoo accounts in the Mail app. There is a macOS 10.13.1 beta that includes some new fixes and features, but it is not available to the general public yet. There is also no macOS 10.13.01 update yet.
Apple delivers a ton of macOS High Sierra features worth upgrading for, but this update isn’t perfect. We’re seeing some reports of install problems and other issues that can prevent you from using your computer.
Here’s what you can do to figure out what’s wrong with your Mac and fix common macOS High Sierra problems on your own.
What to Do if macOS High Sierra Won’t Download
We experienced a slow macOS High Sierra download and a failed download during the first day of the release. If this happens to you, you will need to restart the download in the App Store.
We had to go to the Applications folder in Finder and delete the Install macOS High Sierra app to be able to re-download the file correctly. This is a good first step if you have download problems.
You my need to Force Quit the App Store to restart your download. To do this,
- Click the Apple logo in the upper left.
- Click Force Quit
- Click on App Store
- Click Force Quit
- Click Force Quit Again
- Restart the App Store and try again.
If you can move closer to your Router or plug in your laptop to the Internet you should also see faster download speeds.
What to Do if macOS High Sierra Won’t Install
Common macOS High Sierra installation problems include not having enough space, crashes or freezing and errors at the end of the installation.
If you see a message that you don’t have enough space you should use this guide to free up space on your Mac in just a few minutes. After you get enough free space you can retry the install.
If the macOS High Sierra installer crashes, you may need to try installing macOS High Sierra in Safe Mode. To do this, hold the Shift key while starting your Mac.
For users who see a problem at the end of installing High Sierra, you can try booting into Recovery Mode using Command+Option+R while the mac boots up. From here you can retry the installation.
How to Fix a Mac that Won’t Start After Installing macOS High Sierra
Although rare, if your Mac won’t start right after you install macOS High Sierra, you should try to reset the NVRAM.
To do this restart your Mac and hold Command+Option+P+R while the computer is booting up. On some macs you will hear two chimes to let you know that this is done.
You can also boot into Recovery Mode by holding Command+R while the computer boots. Once in there, open Disk Utility, click on your hard drive that has macOS on it and then choose Repair Disk to check to see if it finds any errors that could fix your boot problems.
How to Fix macOS High Sierra Display Problems
If your MAc is having problems waking from sleep or you have display problems including gray screens, blue screens or flickering images on webpages you need to take the following actions.
First reset your NVRAM. Turn off your Mac. Then turn it on and hold Command+Option+P+R while the computer is booting up. You will hear two chimes or on newer MacBook Pro models you will see the screen come on and go off twice.
Now, shut your computer down again and reset the SMC. With your Mac off, press Shift + Control + Option and then hold these keys while pressing and holding the power button for 10 seconds.
So far this has helped solve some of our most annoying macOS High Sierra problems.
How to Fix Sling TV Problems on macOS High Sierra
There are some issues streaming Sling TV on a Mac with the macOS High Sierra update installed. If you can’t watch Sling TV on your Mac in Safari, you should switch to Chrome. Sling TV recommends this until there is a fix for the streaming problem.
What to do if Your Mac is Frozen on macOS High Sierra
Here’s what to do if your Mac freezes while using macOS High Sierra. Sometimes your Mac will lock up due to an app acting up or a problem with the OS.
If possible you should wait at least 10 to 15 minutes to see if the Mac is able to resolve the issue. If that doesn’t work, or if you can’t wait, you can hold the power button for about 10 seconds to force your Mac to restart.
In cases where this always happens with the same app, you should try uninstalling and re-installing the app. If it keeps happening while using macOS High Sierra across a variety of apps, you may need to troubleshoot further with Disk Utility in Safe Mode or try a clean install of macOS High Sierra.
How to Stop macOS High Sierra From Logging You Out
A common issue is that macOS High Sierra randomly logs users out of the Mac. This is part of a feature, but you can adjust it to change the settings so that it’s less annoying.
Go to Preferences -> Security & Privacy -> Advanced and then uncheck the box that says, “Log out after — minuted of inactivity”.
While you can also turn off your password when the Mac goes to sleep or a screensaver activates, this is not a secure way to solve the problem.
Some users report that they are seeing the macOS High Sierra log out while using Chrome. If that is the case you can try turning off hardware acceleration. In Chrome, click on Settings and then click on Advanced and turn that off.
How to Fix Mac Running Slow on macOS High Sierra
It’s very common to see your Mac running slowly. This is expected for the first 24 hours as the computer must re-index a lot of files for Spotlight and things need to settle in so to speak.
We suggest waiting at least a day or two with your Mac on before worrying that your Mac is in major trouble. If the Mac is still slow after a day or so, try restarting it to see if that fixes it.
If that doesn’t solve your slow Mac problem, open up Activity Monitor and see if there is an app using a lot of RAM or processing power. If there is one, close it and check to see if there is an update to that app. You can also try re-installing that app.
You should also check for updates to macOS High Sierra in the App Store. We expect to see Apple issue a new update in the coming weeks and it could include performance fixes.
How to Fix Microsoft Office Not Working on macOS High Sierra
A very common issue is Microsoft Office not working on macOS High Sierra.
If you are using the older Office 2011 on macOS High Sierra, it is not supported at all. You may have some success using it, but you are likely going to run into apps crashing and other issues with this older software.
If you are using Office 2016 for Mac, you need to install the latest update form Microsoft and then it should work fine.
How to Fix macOS High Sierra WiFi Problems
If your WiFi is slow on your Mac after installing macOS High Sierra, you may need to simply reconnect, restart your computer and restart your router. It may not be an actual macOS High Sierra problem, but an issue with your router.
If restarting everything doesn’t work, you may need to forget the WiFi network on your Mac. To do this, click on the WiFi icon, then on Open Network Preferences. Click on Advanced and then on the name of the WiFi network you are having problems connecting to. Click the minus arrow to delete it.
If this fails, you can try deleting all of your WiFi connections. Go to the System Configuration folder – /Library/Preferences/SystemConfiguration/ to delete a group of files. You can copy that folder location and then press Command + Shift + G while in Finder, then paste that location in to go to the right folder.
Delete all of the files listed above, restart your computer and your router and then reconnect.
How to Fix macOS High Sierra Bluetooth Problems
So far there are no widespread macOS High Sierra Bluetooth problems, but if you are having issues, you should try unpairing the device and reconnecting it to your Mac.
Click on the Bluetooth icon in upper right area of your screen then on open Bluetooth preferences.
Hover over the device and disconnect it from your Mac by clicking on the X. From there, you can re-pair it and see if that works for you.
How to Fix macOS High Sierra Apps Not Working
If you run into apps not working on macOS High Sierra with the error that the app is, “damaged and can’t be opened”, you need to check for updates or clear your cache.
First off check the App Store for updates or check the app website to see if there is a new version. If there is, you may need to upgrade to keep using it.
If that fails to fix the problem, you may need to clear the cache. To do this;
Open Finder and press Command + Shift + G and past in ~/Library/Caches and then delete everything inside the folders. You can also clear out the /Library/Caches folder.
You may also need to re-install the app if neither of these options fixes the problem.
How to Fix USB Devices Not Recognized on macOS High Sierra
If you discover that your Mac doesn’t recognize USB devices, like hard drives, after upgrading to macOS High Sierra, you can try resetting the SMC.
Apple offers a good guide on how to reset the SMC on your Mac. This quick process can solve USB related issues.
If this doesn’t fix the problem you may need to try reinstalling macOS High Sierra, or checking with an Apple Store Genius for help.
What to Know about macOS High Sierra Password Problems
You may have heard that there is a password security issue with macOS High Sierra that could allow someone to get your passwords when you install an app from an unknown source.
While this is an issue that you should stay on top of, Apple promised an update that will fix this, and the researcher did not release how he is able to do it, which means you should be safe if you are cautious about which apps you install on your Mac.
How to Fix Annoying macOS High Sierra Problems
If you end up with a macOS High Sierra problem that you just can’t fix, you may need to start over with a clean macOS High Sierra install and see if that solves your problem.