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  1. #1
    Crashed Mac troubleshooting. Crashed HDD?
    I suspect my hard drive is broken but would like to know if there's anything I can do before turning it to service.

    I'm getting a prohibitory symbol when I try to start the iMac. In recovery mode, when I try to reinstall macOS it doesn't find my internal HDD. I tested Disc Utility to control the HDD, but getting "Error: This disc needs to be repaired using the Recovery HD. Click to repair disc." When trying to repair it, I get "Error: Could not mount disk."

    I also get "Warning: Repair partitioning card failed when structures to fit the entire disk size were adjusted" when trying to repair it.

    I've tried installing macOS on an external drive too, but the computer can not find my hard disk for some reason. It doesn't pop up as an alternative.

    Anyone knows of any solution for these issues?

    (The error messages aren't literally word by word as I've translated them from Swedish.)

  2. #2
    Crashed Mac troubleshooting. Crashed HDD?
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    56,599
    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, Mojave
    Welcome back to our forums.

    Nothing much you can do with that hard drive except to change it out. Hopefully, you have a backup of all your data?

    Not sure what's going on with your external hard drive, but if you have a good installer and a way to install macOS on that external drive, it should work. What method are you using to install macOS on the external drive?

  3. #3
    Crashed Mac troubleshooting. Crashed HDD?
    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, US
    Posts
    5,149
    Your Mac's Specs
    L2014 Mac mini macOS Mojave, iPhone 8+ iOS 12, 12.9" iPad Pro 1 iOS 12, Pencil 1
    It certainly seems like the drive has died. What model year is your iMac? If you have an additional external drive, you may be able yo use that, to run your iMac from?


    Edit: The external drive may need to be formatted first. Boot into Recovery, and select Disk Utility, then select the external and then select "Erase".
    Last edited by ferrarr; 10-27-2018 at 03:10 PM. Reason: added info
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  4. #4
    Crashed Mac troubleshooting. Crashed HDD?
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    24,966
    Your Mac's Specs
    iMac, i7 4GHz, 32GB memory, 1TB Blade, OS X.14.1 Mojave,
    You have got it right with your diagnosis.

    Helps greatly if you provide Mac model and operating system. For example OS X.6 is too old for Recovery, starting in diagnosis (Command + D) only works on late 2013 iMacs and later etc.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  5. #5
    Thanks for the quick replies.

    Quote Originally Posted by chscag View Post
    Hopefully, you have a backup of all your data?
    I do, yeah.

    Quote Originally Posted by chscag View Post
    What method are you using to install macOS on the external drive?
    I start up holding ⌘+⌥+R (recovery mode).


    Quote Originally Posted by ferrarr View Post
    What model year is your iMac? If you have an additional external drive, you may be able yo use that, to run your iMac from?
    I don't remember the year. I think it's 2015 or 2016.

    Quote Originally Posted by ferrarr View Post
    Edit: The external drive may need to be formatted first. Boot into Recovery, and select Disk Utility, then select the external and then select "Erase".
    It's formatted for my Mac though. I used this hard drive before the Mac broke. I can see it in Disk Utility, but don't wanna erase the content on it.

    Quote Originally Posted by harryb2448 View Post
    You have got it right with your diagnosis.

    Helps greatly if you provide Mac model and operating system. For example OS X.6 is too old for Recovery, starting in diagnosis (Command + D) only works on late 2013 iMacs and later etc.
    It's newer than X.6. I think it was Sierra or El Capitan. I can't stard with Command + D. I just get the prohibitory symbol or it just shuts down when I try.


    Edit: My external hard drive showed up now for some reason, for the first time in dozens of attempts. Trying to install macOS on it now.

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