How to recover data from a Mac that is no longer started?

Help! My Mac won't start!

Due to the slowness and errors on the Mac this week, I tried to clean it up (the memory was too full) and look for all possible errors and various updates. Since then, my macbook pro has had a big problem. Except when I enter the command R mode of OS X users, it no longer lights up and displays a circle with a cross. I bought an external hard drive, but unfortunately I didn't have time to copy my hard drive. I can't lose all the data. This is really my working tool and I can't find a solution. Can we reinstall OS X without losing unsaved data on the disk? I have to recover these data first. Thank you for your help. I am desperate. ......

Your Mac refused to start, and you didn't make a good backup of the data on your computer. If you encounter such a problem, relax! This article will show you how to recover data from a Mac that no longer starts, just follow one of the suggested methods to repair the Mac that can't start.

Two quick solutions to fix Mac failure to start.

Solve 1 quickly. Reset your SMC to fix the problem that the Mac can't start.

Sometimes, if the cable of the Mac computer is not connected correctly, you may not be able to start it normally. Therefore, you can try to reset the system management controller (SMC) to solve this problem.

On the laptop, press Shift, Control and Option/Alt；; When the charger is plugged in; For stationary computers, unplug the power cord 15 seconds, and then plug it in. Wait for 5 seconds, and then turn on the power.

Quick solution 2. Attempt to forcibly restart and reset NVRAM.

1. Press and hold the power button for several minutes until the Mac is turned off; 2. Wait a few seconds, then press the power button to turn on the Mac；; 3. Press and hold Command+Option+P+R to reset NVRAM and start Mac; 4. Restart the computer again to see if the problem is solved.

Note: If these two quick fixes can't help you repair the Mac that can't be started, please continue to use the complete solution below to solve your problem immediately.

A complete solution to repair Mac failure and data recovery.

Step 1. Recover data from a Mac that is no longer started.

If you have saved important data on the hard disk of the Mac computer, please remember to restore your data before taking measures to repair the Mac startup error.

Professional bootable disk Mac data recovery software can help you recover data from the Mac hard disk effectively when the computer can't be started. You can directly use the simple data recovery Mac version to recover the data in the data Mac.

Download Mac version download Win version

1. Insert the bootable media created on the Mac, turn on the Mac computer, and immediately press and hold the Option key to start the easy data recovery Mac version; 2. Connect the external storage device to the Mac computer.

When the Simple Data Recovery Mac version is started, please follow this tutorial to recover the lost files on the Mac.

Step 1. Select the disk location (which can be the built-in hard disk or removable storage device) of the lost data and files in the Easy Data Recovery Wizard of mac Pro. Click the Scan button.

Step two. Easy Data Recovery Mac Edition will immediately scan the disk volume you selected and display the scanning results in the left panel.

Step three. In the scan results, select the file and click the Restore Now button to restore the data.

Step two. Repair the Mac that can't be started.

Method 1. Start the Mac in safe mode.

1. Open the Mac, press Shift when you hear the startup sound, and release it until the Apple logo appears.

2. After the 2.MAC is fully started, restart the computer normally without holding down the key/button;

3. Wait for your Mac computer to complete the restart process.

Method two. Use Disk Utility to restore your Mac from recovery mode.

1. Start the Mac, and press command+r during the startup process; 2. Click the Disk Tools option and click First Aid to try to repair the Mac disk; 3. Disk Utility will automatically perform fsck (check file system) operation to help you repair the Mac4 that can't be started. 4. If it fails, try to recover from recovery mode; 5. Reinstalling OS X in recovery mode will automatically download and install the latest Mac OS High Sierra for your MAC device.

Method three. Run the terminal to repair the Mac hard disk that can't be started.

Open the terminal utility. Enter: system _ profile sp extension datatype ~/desktop/kextlist.txt, and click enter; Open the kextList.txt file on the desktop, and press Apple(Command)+F to bring up the search; In the search box, insert. The kext file is obtained from: unsigned, and the target is copied to the list for later use; Click Next to browse all, for example:/system/library/extensions/jmicronata.kext; Browse the drive to /System/Library/Extensions and delete all unsigned kext files; Restart, the problem of starting the Mac should be solved.

Method four. Reload macOS High Sierra to solve the Mac initialization problem.

The last method you can try is to download macOS High Sierra and create a new bootable drive, so that you can install Mac OS High Sierra on a MAC computer to make it start normally and work normally again.

1. Connect the USB boot driver to the Mac, and restart the MAC by holding down the option until you hear the restart tone; 2. Select the drive named Install macOS High Sierra from the list of drives displayed on the screen; 3. After the USB flash drive is started, select Disk Utility, select Mac Start from the list, and click Erase; 4. After formatting the MAC startup disk, return to the Utilities window and select Install macOS. Simply choose to erase the startup disk to install macOS, and follow the on-screen prompts to complete the installation.

It may take you several hours to finish this task. Of course, if you have some important data, please use the Easy Data Recovery Mac to recover your data.