If you do not have a bootable external macOS drive, then you could create a bootable Knoppix Linux USB drive using Etcher (Mac/Windows/Linux). If you have an external macOS USB boot drive you can run DriveDX from it to check the health of the computer's hard drive. The easiest way to check the health of the hard drive is to boot the computer from an external drive since I'm not sure Target Disk Mode will allow the necessary communication to the drive. Using the wrong app can just increase the difficulty of recovering data and wear the drive out even faster. If so it may be difficult to transfer files from it depending on how bad the failure is since most apps (even data recovery apps) have trouble handling the errors produced by a failing drive. Today, for a try, I mount another macbook (OS: 10.14.6) by using T mode, run First Aid, then reboot the macbook, the same issue happens, local admin failed to login.Īny idea how to fix this issue? just want to copy the data out.įrom your description I suspect the computer has a failing hard drive. Input the recovery key, the same results, it turns out we can not pass through the Preboot interface. I shutdown user’s Macbook, user tried to login, in preboot interface, after user input user name and password, the password column shaking just like input wrong password, tried local admin, the same results. Then I thought this time user may be able to login to the system without black screen. User copied out maybe 30GB to 50GB data, then deleted 100GB data. The 2TB hard disk almost got full, only left 38GB free disk space, that maybe the reason why user experienced black screen. User comes to me because her Mac OS will stay in black screen after login for a long time.ġ, Run First Aid using Disk Utility in Recovery mode, restart, still black screen after login.Ģ, then I tried mount this Mac by using T mode, I succeeded unlock it with local admin account (we use this to enable FileVault2) and mount the hard disk. Back ground: user's Mac OS version: 10.13.4, Filevault 2 is enabled.
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