How to Recover Data from a Non-Booting or Crashed Mac?

A Mac that refuses to boot can be alarming, especially when important documents, photos, or work files are trapped inside. Whether your Mac is stuck on the Apple logo, caught in a restart loop, showing a flashing question mark, or simply displaying a black screen, it's easy to assume your data is gone for good.

Thankfully, a boot failure doesn't always mean your files have been lost. In many cases, the problem lies with macOS, the startup process, or your Mac's hardware rather than the storage itself. The recovery approach, however, depends on what's actually preventing your Mac from starting. A Mac that still powers on but won't load macOS is very different from one that won't turn on at all.

In this guide, we'll help you identify which situation you're dealing with and walk you through the safest ways to recover your data from both Intel and Apple Silicon Macs. We'll also explain when DIY recovery is possible, when professional assistance is the better option, and the precautions you should take to avoid making data loss worse.

Find Out Why Your Mac Won’t Boot

Before you recover your files, identify what’s actually preventing your Mac from booting up. If your Mac still powers on but gets stuck during startup, this means the data is still intact and can usually be recovered using one of the DIY methods covered in this guide. On the other hand, if your Mac shows no signs of power or has suffered physical damage, the issue is more likely hardware-related. Software-based recovery methods do not work in this case.

If your Mac still powers on, even if it can’t load macOS, there’s a good chance your files can be recovered using the methods in this guide. However, if it won’t turn on at all, or it has been dropped, exposed to liquid, or suffered other physical damage, avoid repeated power-on attempts. These situations require hardware diagnosis, and continuing to use the Mac could reduce the chances of a successful recovery.

On macOS Tahoe, your Mac may automatically launch Recovery Assistant to diagnose and fix common startup problems. It’s worth letting it run first, since a successful fix means you won’t need to recover anything. If it can’t resolve the issue, or you want to secure your files first, you can open Recovery Assistant anytime from the Utilities menu in macOS Recovery, or move straight to the DIY methods below.

Before You Start: Don’t Make It Worse

When your Mac refuses to boot up, it’s only natural for you to try everything you can to get it working again. But some of these steps can make data recovery much more difficult or even overwrite the files you’re trying to save. Before trying out any fixes, keep these precautions in mind:

• Do not reinstall macOS right off the bat as it can overwrite system data. Recover your important data first.
• Avoid running First Aid if your priority is data recovery. While First Aid can repair file system errors, it also modifies the disk. In case you find out that the hard drive is failing or severely corrupted, it is safer to recover your data before attempting repairs.
• Do not restore your Time Machine backup to the affected startup disk.
• Always save recovered files to a different drive.
• Avoid repeatedly forcing your Mac to restart.

DIY Methods to Recover Data from a Non-Booting or Crashed Mac                                                                                                              

Recovering data from a working Mac is easy as you can apply any available backup and recovery option on the system. However, when it comes to a crashed Mac, it's a different story. You need to perform certain specialized procedures to secure the data saved on your non-bootable Macintosh HD. Here are some DIY methods to recover your data from a non-booting Mac.

Recover Your Data Using Target Disk Mode or Share Disk

If you’re someone whose Mac powers on but doesn’t boot into macOS, there’s a way you can still access its internal storage from another Mac. The only catch here is that your Mac’s internal storage should still be accessible. If the startup disk is physically damaged or you can’t unlock an encrypted FileVault volume, the disk may not mount on the second Mac.

The exact method will depend on the processor used by your Mac.

• Intel-based Macs support Target Disk Mode. It lets your Mac function like an external drive when it’s connected to another Mac.
• Apple Silicon Macs (M1, M2, M3, and M4) use Share Disk Mode. It also provides similar feature through macOS Recovery.

1. Recover Using Target Disk Mode (Intel Macs)

Target Disk Mode will turn your non-booting Intel Mac into an external drive so you can pull files of it from a second Mac.

• Connect the non-booting Mac (the source) running macOS Big Sur or later to a working Mac using a Thunderbolt cable. On older Intel Macs before Big Sur, a FireWire cable also works. The 12-inch Retina MacBook (2015-2017) is a notable exception since it has neither a Thunderbolt nor a FireWire port. It supports Target Disk Mode over its USB-C port.
• On the non-booting Mac, press the power button and immediately press and hold the T key until a Thunderbolt or FireWire icon appears on the screen.
• The source Mac should now appear as an external disk icon on the working Mac’s desktop.
• On the other Mac, open a Finder windows, then-double-click the source Mac in the sidebar.
• Drag the files you need onto the working Mac to copy them.
• When you’re done, Control-click it in the Finder sidebar and choose Eject.
• Shut down the source Mac by holding its power button.

2. Recover Using Share Disk Mode (Apple Silicon Macs)

Apple Silicon doesn’t support the classic T-key Target Disk Mode. Instead, they use Share Disk accessed, through macOS Recovery.

• Connect the two Macs using a USB, USB-C, or Thunderbolt cable.
• Shut down the non-booting Mac completely, then press and hold the power button until Loading Startup Options appears.
• Click Options, then click Continue. Enter the admin password, if prompted. The Mac starts in macOS Recovery.

• In the Recovery app’s menu bar, choose Utilities > Share Disk.

• Select the internal disk or volume you want to share (unlock it if FileVault in on).
• Click Start Sharing.

• On the working Mac, open a Finder windows and click Network from under the Locations sidebar.
• Double-click the source Mac’s name, click Connect As, select Guest and then click Connect.
• Transfer the files you need. When finished, eject the shared disk on the working Mac.

Recover Using Data Recovery Software in Recovery Mode

Avoid the hassle of complex manual recovery procedures by opting for specialized Mac data recovery software – Stellar Data Recovery Professional for Mac. It’s clean user interface and advanced features make it an excellent DIY tool for retrieving documents, photos, audio, and video files from a non-booting or crashed Mac.

Note:  Make sure your Mac is connected to the internet and keep the license key ready.

To configure the software on a non-booting Mac using Apple Silicon chip:

• Press and hold the power button to boot into Recovery Mode.
• Select Options on the start screen and click Continue.

• macOS Recovery window will appear. Click Next to go to the login option.
• Type in your Admin password and click Continue to proceed.
• On the Recovery Mode screen, click Utilities > Terminal.

• Enter the following command in the Terminal window and hit Return: 

sh <(curl https://www.stellardatarecovery.co.in/StellarDataRecovery.xml)

• Accept the License Agreement and launch the software.

To configure the software on a non-booting Intel Mac using T2 chip:

• Power on your Mac and press Command+R to boot it into Recovery Mode.
• Connect your Mac to an active Wi-Fi network and click Utilities > Terminal.
• Enter the following command into the Terminal window and hit Return: 

sh <(curl http://www.stellardatarecovery.co.in/StellarDataRecovery.xml)

• Accept the License Agreement and launch the software.

Once you have configured the software on your respective Mac, follow the steps below to recover your data.

• Select the type of files you want to recover and click Next.

• Select the storage volume you want to recover from and click Scan.

• Once the scan is complete, the recovered files will be displayed for you to Preview.

• Select the files you want and hit Recover to move them to your desired location.

Recover Files Using Time Machine (macOS Tahoe)

Time Machine is a built-in tool on Mac that allows you to create incremental backup of your Mac’s data. If you had backed up the Mac prior to when the non-booting issue started, you can restore it via Recovery Mode.

• Plug the Time Machine backup drive to your Mac and boot into Recovery Mode.
• Choose Reinstall macOS and follow the on-screen instructions.
• Once reinstalled, you'll land on either the Setup Assistant (if the disk was erased) or the desktop.
• If Setup Assistant appears, continue through it until you reach the option to transfer your information.
• If you land on the desktop, open Migration Assistant using Spotlight.
• Choose Transfer from a Mac, Time Machine backup, or startup disk, then click Continue.

• Select your Time Machine backup disk and click Continue.
• Choose the backup you want to restore from. If the Continue button is disabled or you want to use an older backup, click the disclosure arrow next to the backup shown, then select a backup.

• Select the data you want to restore, user accounts, applications, documents, settings, then click Continue.

• Set a password for the admin account if prompted, then wait for the migration to complete. Large backups can take several hours.
• Sign in to your restored account once the process finishes.
• From the list of available backups, select the files/folders you want and click Restore.

• Select the destination drive for the restored files and save the restored data.

Suggested Read: How to Recover Deleted or Lost Files Using Time Machine on Mac

Reinstall macOS on an External Drive and Recover Your Data

If your Mac doesn’t boot up but its internal storage is healthy, then you can install macOS on an external drive and use it as a temporary startup disk. After your Mac boots from the external drive, you can access the internal startup disk and copy your files. This method, however, is useful only when your Mac’s operating system is corrupted, but the internal drive itself is still readable.

You will need an external HDD, SSD, or pen drive with at least 32 GB of free space (64 GB or more recommended) and a stable internet connection.

Note: On Macs with a T2 chip, external booting is disabled by default. So you got to boot into macOS Recovery, open Startup Security Utility from the utilities menu, and enable “Allow booting from external or removable media” before you begin.

• Connect the external drive to your Mac.
• Boot into macOS Recovery.
• Open Disk Utility.

• Erase the external drive and format it as APFS or Mac OS Extended (Journaled) for older macOS versions.

• Return to the Recovery windows and select Reinstall macOS.
• When prompted to choose the installation disk, select the external drive.
• Complete the installation and boot your Mac from the external drive.
• Once macOS loads, open Finder and check whether your internal startup disk appears under Locations.
• If the drive is accessible, copy your important files to another external storage drive.

How to Prevent Your Mac from Crashing or Losing Data?

While you cannot prevent every Mac startup issue, a few good habits can greatly reduce the risk of crashes and data loss. They also ensure you have a reliable way to recover files if something does go wrong.

Keep macOS and Apps Updated

Software updates often include bug fixes, security patches, and firmware improvements that address startup problems and system instability. Install updates regularly but also create a backup before installing major macOS upgrades.

Back Up Your Data Regularly

Use Time Machine to automatically back up your Mac to an external drive. Try to follow the 3-2-1 backup rule and keep a separate backup in the cloud or another external storage.

Monitor Your Storage Health

Keep an eye on your Mac’s storage health using Disk Utility or your preferred disk monitoring tool. In case you notice repeated errors, unusually slow performance, or random system crashes, back up your data immediately and get the drive checked.

Always Shut Down Properly

Do not force shut down your Mac unless it has completely stopped responding. Sudden power loss or repeated forced shutdowns can corrupt system files and increase the chances of startup-related issues.

Maintain Enough Free Storage

macOS needs free disk space for virtual memory, updates, and temporary files. If you run your system with very little storage space, it can lead to slow performance, failed updates and, in some cases, boot issues. Keep at least 10-20% of your startup disk free.

Bottom Line

If your Mac doesn’t boot, it does not mean your data is gone. Often, the issue is limited to the operating system or startup process while your files remain recoverable. The idea is to identify the type of startup failure, avoid steps that could overwrite your data, and choose the right recovery method.

In case your Mac powers on then methods like Target Disk Mode, share Disk, Time Machine, or a Mac data recovery software can help you reclaim your files. But if your Mac completely refuses to turn on, or has suffered physical damage, then a professional data recovery service may be the only viable option.