Mac Mini Fails to Start Up After Reinstalling High Sierra? Here Are 6 Solutions to Try

Apple has released a number of updates for MacOS High Sierra in an effort to fix commonly reported issues. It is no surprise why many users always make it a point to install the newest version of the OS.

However, while some had pleasurable experiences, others had otherwise. Some complained that after reinstalling High Sierra, their Macs won’t turn on. It’s either their Macs can’t boot or they don’t start up properly.

The good news is that there are ways to resolve your Mac can’t start up after reinstalling High Sierra problem. We’ve listed them below:

1. Reset the NVRAM.

When your Mac or Mac mini fails to start after reinstalling High Sierra, the first solution you may try is to reset your device’s Non-Volatile Random Access Memory (NVRAM).

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The NVRAM is a special memory section of your device that is responsible for storing important settings that may be needed or called upon even when your device is shut off. This includes your screen resolution and volume settings.

Resetting the NVRAM is easy and safe. Here’s how:

  1. Turn off your Mac.
  2. Hold down the Option, CMD, P, and R keys while pressing the Power button.
  3. Keep holding the five keys until you hear the startup tone.
  4. If the progress bar fills up and continues, you’re probably all set.

2. Reset the SMC.

If resetting the NVRAM doesn’t work, try resetting the System Management Controller (SMC). To do it, follow these steps:

  1. Turn off your Mac.
  2. Unplug the power cord from the power source.
  3. Disconnect all cables.
  4. Wait for a couple of minutes.
  5. Connect all the cables.
  6. Plug your Mac to the power source again.
  7. Press the Power button.

3. Reboot Your Mac in Safe Mode.

To troubleshoot problems with Macs, experts usually boot their devices in Safe Mode. In this mode, only the most important processes are enabled by the system. Hence, it will be easier to pinpoint issues and problems.

Follow the steps below to reboot your Mac in Safe Mode:

  1. Make sure your Mac is switched off.
  2. Switch it on by holding the Power button and the Shift key.
  3. Once the login window appears, release the keys and enter your login credentials.
  4. Restart your device.
  5. Wait until your Mac finishes the whole reboot process.

4. Run Disk Utility

Oftentimes, running Disk Utility can fix the problem and restore your Mac when High Sierra does not boot. To use it, follow these instructions below:

  1. Try booting your Mac by pressing the Power button.
  2. During the boot-up stage, hold the CMD and R keys.
  3. At this point, Disk Utility should open and run a quick system file check. It will then attempt to repair the High Sierra boot errors it discovers.

5. Create a New Bootable Device.

Many Mac users have found success fixing the problem by creating a new bootable device and reinstalling macOS High Sierra. Here’s how to do it:

  1. Connect a bootable USB drive to your Mac.
  2. Restart your Mac by holding the Power and Option Release them as soon as you hear the reboot tone.
  3. Choose the disk named Install macOS High Sierra.
  4. As soon as the drive has booted, go to Disk Utility.
  5. Select the Choose Mac’s startup from the list option.
  6. Hit This action should format your Mac’s startup disk.
  7. Now, go to the Utilities window.
  8. Choose Install macOS.
  9. Select Erase startup drive to install macOS.
  10. Follow the onscreen prompts until the installation is complete.
  11. Depending on the size of the files you have on your Mac, the process may take hours to complete. We suggest that you be more patient.

6. Take Your Mac to a Legit Apple Repair Center.

If your Mac still does not reboot after trying the solutions above, we suggest that you reach out to Apple Support or take your Mac to a legit Apple Repair Center. It is possible that the problem is with your internal hardware or the logic board. Fixing these aspects might not be easy, so leave the work to an expert.

Once the problem is fixed, make sure that you optimize your Mac and repair any speed-reducing issue. To do this, install a trustworthy Mac repair tool. Run the tool and let it scan your system for any issues.

The Bottom Line

High Sierra problems cannot be avoided. However, you can always do something to fix them. Though some of the fixes are quite technical and complicated, others are as easy as rebooting your Mac. It’s just a matter of researching and following the instructions one at a time. Hopefully, this guide taught you how to resolve problems with your Mac Mini not turning on after reinstalling a High Sierra update.

Did any of the solutions above help you with your problem? Which of them worked best? Share your experiences or thoughts with us below!

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