When this happens, you can troubleshoot your Mac by using boot options to run an Apple Hardware Test, or booting with extensions disabled. Keep holding Shift until you see a gray progress bar appear beneath the Apple boot logo. Remember, this is only possible with 2011 models of the iMac and MacBook Pro and any other Thunderbolt Macs Apple may release in the future. A firmware password: If the Mac has a firmware password set, it will not be able to enter Target Disk Mode. Connect your Macs via a Firewire or Thunderbolt cable. I have kept it for hours assuming that the back up would take a long time but it never gets past that screen. If your Mac is stuck restarting in a Safe Mode loop, try entering another startup configuration, the Recovery Mode, by pressing Command? FileVault encryption: If the Mac you intend to use Target Disk Mode on is using FileVault to encrypt the internal drive, then Target Disk Mode will fail.
Press N During Startup If your setup includes a compatible network server NetBoot , you can hold down the N key during startup to attempt a network boot. Connect the bootable installer drive to your Mac. Until recently, you enabled Target Disk Mode by connecting two Macs together via FireWire. The operating systems should be the same. Wait for the status bar to load completely then follow the prompts to complete the process.
Troubleshooting in Safe Mode Once your Mac is running in Safe Mode, some applications will no longer be available. Keep holding as your Mac boots, which may take a few moments depending on its specific configuration. Making backups of your files is important. Unfortunately it is a bit difficult to see if this is the case when the system is only displaying a gray progress bar; however, you can force the system to show you what is going on by having it boot to both Safe and Verbose modes at the same time. To create this article, 13 people, some anonymous, worked to edit and improve it over time. Once the target Mac is running in Target Disk Mode, you can boot the second Mac normally.
Keep holding them until you see the Apple logo. Hence we pen this article as a detailed solution to the mac recovery mode not working issue. Open and create more at one time with less slowdowns. To start your Mac in Recovery Mode, first, if your Mac is turned off, switch it on. Have Yosemite and keep it updated.
Hold down the T key and start up your Mac. Who says the optical drive is dead? In some instances, when it is pertinent for users to restart their MacBook via the recovery mode, they might be distraught to discover that the mac recovery mode is not working. In Target Disk Mode, you can access the target computer's drive with the same freedom you would have with any other disk connected over FireWire. Press Option During Startup Holding down the Option key during startup will show you a boot screen with all bootable devices listed. Each Mac needs either a Thunderbolt port or a Firewire port. Using this key combination will cause your Mac to become very verbose on startup and will show a terminal-like interface while booting. Access Files, Use Migration Assistant, and Boot From Another Mac While in Target Disk Mode, your Mac will act as an external drive and appear in the Finder on your other Mac.
Click the Target Disk Mode button. This mode is good for when you need to troubleshoot a startup issue, or modify a file or application that is preventing proper startup. This may take a while. In our example, we'll use a 2012 Retina MacBook Pro left as the host to boot a 2011 MacBook Air right as the target. Mauricio Grijalva shows how to do it. Sometimes, launching your Mac this way can help save you a trip to the Apple Store. Protect and enhance , , and with cases, headphones, screen protectors, batteries, stands and more.
The connected Time Machine should boot after a while. Booting will then continue, using the operating system installed on the target Mac. Continuously tap the Options button until you hear a chime sound. Choose System Report, then Software, and from there you will be able to see whether you are in normal or safe mode. This is your computer sending the information about its original state to Apple to request the appropriate drivers and may take some time depending on your internet connection. Several users have reported this issue. As described above, CleanMyMac is our favorite you can for free.
Select the disk that corresponds to the target disk. Press Command + V During Startup Command + V boots your Mac into what is called Verbose Mode. Release the keys after you hear the second startup chime. So, give it a try — you can. But it does all of that without any disassembly — just reboot and plug it in. Before doing anything, however, you may want to backup your files and documents. Target Disk Mode allows you to perform the same process, while skipping the disassembly of the Mac and the installation of the drive in an external enclosure.
When a Mac fails to start up normally, one of the common troubleshooting practices is to verify and repair the startup drive. This method will backup to an external hard drive. A startup drive that is experiencing problems is likely to prevent your Mac from starting, so you may find yourself in a catch 22. As soon as you hear the startup chime, press and hold Command? This option is great to use when your local drive is completely corrupted and you no longer can access locally-stored recovery tools. Different models and years have different support for internal hardware. If you find one method overwhelming, there are several other alternatives you can use. While sometimes third-party tools like DiskWarrior have been known to find and correct errors that Disk Utility cannot fix, an alternative approach is to simply reformat the hard drive.