What Are The Common Unrecoverable Error Mac That Can Be Fixed?

Mac Error computers are known for their reliability and stability. However, like any computer, Macs can still experience errors from time to time. Some errors may seem unrecoverable at first, displaying cryptic messages that make fixing the issue feel impossible. Thankfully, many common Mac errors have relatively simple solutions that can get your computer up and running again quickly. In this article, we’ll explore some of the most common unrecoverable errors on Mac and how to resolve them.

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SecurityAgent Errors

One of the most common unrecoverable errors on Mac is the “SecurityAgent” error. This typically occurs when there is an issue with the macOS security services. There are a few variations of this error:

SecurityAgent was unable to create requested mechanism builtin:unlock-keychain

This error appears when trying to open the Keychain Access app or access keys stored in the Keychain. The Keychain stores passwords, encryption keys, and digital certificates on Mac. When the Keychain becomes corrupted, this error can occur.

To fix it, try rebooting your Mac. This will reset the Keychain and clear out any corrupted files.

If that doesn’t work, you may need to delete and recreate the Keychain files. To do this

  1. Boot into Recovery Mode by holding Command + R when restarting your Mac.
  2. When in Recovery Mode, select Disk Utility.
  3. Click Continue to start up Disk Utility.
  4. Select your startup disk and click Unmount.
  5. After unmounting, click Erase. This will delete all Keychain files on the drive.
  6. Reboot your Mac and let it rebuild the Keychain files from scratch. This should resolve the error.

Security Agent was unable to create requested mechanism TeamViewerAuthPlugin:start

This error message can appear after uninstalling the TeamViewer remote access software. Even if you fully uninstall TeamViewer, some corrupted files may remain that prevent the Mac security services from starting correctly.

To fix this issue:

  1. Restart your Mac and immediately hold down the Command + R keys to enter Recovery Mode.
  2. When the Recovery screen appears, select Disk Utility.
  3. In Disk Utility, check your startup disk for errors and problems by clicking First Aid. Let Disk Utility repair any issues it finds.
  4. After repairs complete, restart your Mac normally. The SecurityAgent error should no longer occur.

SecurityAgent Unrecoverable Error Mac TeamViewer

In some cases, fully uninstalling and reinstalling TeamViewer may not resolve the SecurityAgent error on startup. This can happen if critical security files are still missing after uninstalling TeamViewer.

To resolve this, you’ll need to replace the missing files manually:

  1. Download the missing framework file from Apple’s site or a trustworthy third-party source. The file is called Security.framework.
  2. Copy the Security.framework file to /System/Library/Frameworks on your Mac startup drive. You may need to enter an administrator password.
  3. Reboot your Mac. The security services should now start up correctly with the required framework file restored.
  4. Check for any other missing framework files that may cause startup issues. Repeat the file copy process for any other missing components.

SecurityAgent was unable to create requested mechanism builtin:prelogin

The “builtin:prelogin” variation of the SecurityAgent error appears on startup, right before the login screen. This prevents you from being able to log in normally.

The issue is often caused by system files becoming corrupted during an update or restore. To resolve it:

  1. Boot your Mac into Safe Mode by holding the Shift key after powering on. This loads a minimal set of drivers and services.
  2. If you can boot successfully in Safe Mode, run Disk Utility and check your startup drive for errors. Let Disk Utility repair any problems.
  3. Reboot normally and see if the prelogin SecurityAgent error still appears.
  4. If the error persists, reset your Mac’s NVRAM/PRAM. This clears out system boot caches and resets default settings.
  5. Try booting normally again. The NVRAM reset should clear the prelogin error.

Can’t Boot After Uninstalling TeamViewer

As the previous fixes show, TeamViewer can sometimes cause boot issues even after being uninstalled. This is often due to corrupted or missing files that the system expects TeamViewer to provide.

If your Mac gets stuck on a loading screen after uninstalling TeamViewer, you likely need to reinstall the app to replace the missing files. To do this:

  1. Boot into Recovery Mode and open Disk Utility.
  2. Use Disk Utility to repair disk errors and permissions issues.
  3. Reinstall the TeamViewer app from their website. Make sure you get the full uninstall version.
  4. Complete the reinstallation process. Allow TeamViewer to replace any missing components.
  5. Fully uninstall TeamViewer again using the platform-specific uninstaller.
  6. Reboot your Mac. It should now start up normally without TeamViewer installed.

This process forces TeamViewer to reinstall the frameworks and plugins it needs, correcting any issues left over after the initial uninstall. With the files replaced, removing TeamViewer properly should no longer cause boot problems.

Can’t Start Up Mac

A completely unresponsive Mac that won’t start up at all can be caused by many issues. Before assuming that your Mac is bricked, there are a few basic steps to try:

  • Reset NVRAM/PRAM – This clears out system memory caches and resets boot variables that may have become corrupted.
  • Boot to Recovery Mode – From Recovery, you can repair disk errors, recover data, and reinstall the OS if needed.
  • Boot to Safe Mode – Safe Mode loads a minimal boot configuration with only essential drivers.
  • Check connections – Make sure display cables, power cords, and other connections are firmly plugged in.
  • Try external display – Connect your Mac to an external monitor or TV to check for video output.
  • Test memory modules – Unseat and reseat Mac RAM to ensure the modules are connected properly.
  • Reset SMC – The System Management Controller handles critical hardware functions and may need to be reset.

If your Mac still won’t start after trying these steps, the next option is to reinstall macOS from Recovery Mode. To do this:

  1. Enter Recovery Mode by holding Command + R on startup and select Reinstall OS.
  2. The installer will automatically erase the drive and install a clean version of macOS.
  3. If installation still fails, the drive itself may be having hardware issues that require service or replacement.

Reinstalling the operating system often resolves mysterious boot issues by overwriting corrupted software components. Just make sure to backup your data first!


While unrecoverable error messages can certainly be intimidating, many common Mac startup and boot problems have relatively straightforward fixes. Issues with security services, TeamViewer, and basic operating system functions typically just require a few steps to isolate and correct the problem files.

By understanding the causes behind these common errors, Mac users can quickly get their computer operational again. Recovery Mode provides an essential fallback environment for diagnosing and repairing many boot issues. And when all else fails, completely reinstalling the OS can overwrite any corrupt files that are preventing startup.

While a Mac Error may rarely have truly catastrophic failures, most unrecoverable errors just take a little targeted troubleshooting. Backing up your data regularly is also key, so important files can be restored after any system-level repairs. With the right knowledge and preparations, even ominous-sounding startup errors don’t have to be a major crisis.

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