What to Do When You Cannot Login after High Sierra Update?

Here is another bug from Apple that drives many Mac owners crazy after the upgrade to High Sierra. When starting, it is impossible to log in! The user tries to type the passcode for his or her account, but it only leads to the login progress bar that freezes at approximately ¾ mark before showing the sign in request once more. This time the system does not accept the password even though it is correct. Rebooting in Safe mode does not solve the problem. So, is there any way out?

Isn’t it a pity when a MacBook Pro does not let its owner in? From one side, experts recommend updating to the latest OS releases all the time. On the other side, this action causes certain difficulties in some cases. It does not matter whether you switch from Mac OS X or macOS to High Sierra – such issues may pop up, unfortunately. The worst thing is when you decide to wait and give it a chance just to find out the system crashes, and nothing has changed in a couple of days.

When rebooting, you may notice that the operating system was upgraded while the attempts to log in fail one-by-one.

To check whether it’s that dramatic, try reinstalling from recover (Command and R keys at a time). One more common solution is to reset the passcode from the guest account and recovery.

However, in case nothing works, you may need heavy artillery to figure it out.

Are You Running out of Space?

The most common problem of such failure (as well as many other pitfalls) is the full boot drive. A startup disk may be fed up with various login and startup items that do not let you in. Some other types of junk may be the cause as well. Just check the availability of free space on your Mac using one of the built-in features.

  1. Pick the Apple icon in the menu at the top-left corner.
  2. Select About This Mac.
  3. Choose Storage.

Note: if the amount of available space on a bootup disk is only 20GB, it might be causing the problem with login.

Get Rid of the Login/Startup Items

So, once you realize the bootup disk is really filled, erase the junk files that are slowing down the process. For the login files that prevent the process, take the offered steps:

  1. Launch System Preferences.
  2. Move to Users & Groups.
  3. Select the nickname you wish to use.
  4. Select the Login items pane.
  5. Put ticks next to the items you wish to delete.
  6. Push the minus below.

To return a specific login process later, push the plus button. Reboot the Apple computer after each change like that.

What about erasing startup items? Is there any difference? Well, they either may slow down your Mac or prevent it from booting at all. Thus, eliminate the unnecessary startup files too.

  1. Launch Finder.
  2. Push Command, Shift, and G buttons.
  3. Enter the given directory path: /Library/StartupItems

Get rid of any items in this folder by moving them to another location. It could be the Desktop, for example; after all, you may need some of the startup items sooner or later. Reboot the computer.

Anything Else You Can Do?

Yes, there are a couple of other ideas to implement in case you are still stuck at the login stage.

  1. Download the High Sierra installer from the official App Store.
  2. Shut down the application when it launches automatically after the download is completed.
  3. Come up with a High Sierra bootable drive with the help of Terminal. The drive should be minimum 12GB.
  4. Go to the Applications folder à Utilities to launch the Terminal app.
  5. Enter one of the commands below in the apps’ window. Make sure the name of the volume is MyVolume.
  • High Sierra:
    sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install\ macOS\ High\ Sierra.app
  • Sierra:
    sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install\ macOS\ Sierra.app
  • El Capitan:
    sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app
  • Yosemite:
    sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install\ OS\ X\ Yosemite.app
  • Mavericks:
    sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install\ OS\ X\ Mavericks.app
  1. Push the Return key after typing one of the lines.
  2. Enter the admin’s passcode and push the Return button one more time.
  3. Enter Y to confirm your actions.
  4. Shut down the Terminal window.

The second alternative is to download and install one of the numerous third-party apps for Mac with such functionality. Watch out when choosing one not to download malware or adware by accident.

After getting the bootable installer, start from it to try a reinstallation. In case nothing happens after the reinstallation, remove, reinstall, and restore personal items from the backup. Oh, and by the way: never forget to perform a backup!