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Help!! iMac Won’t Boot!

Discussion in 'Apple Hardware' started by Valo, Nov 8, 2019.

  1. Valo

    Mobster

    Joined: Oct 18, 2002

    Posts: 3,492

    Location: Livingston

    My late 2013 iMac has decided to stop working on me. I restarted after noticing some sluggish performance and now it will not boot back in to macOS at all.

    Specs
    Late 2013
    27”
    3.5Ghz i7
    32GB RAM
    1TB Fusion Drive
    4GB GeForce GTX780M

    I get the normal boot chime and Apple logo with boot status bar but it’s going incredibly slowly. If I leave it for awhile the boot status bar does eventually go white but macOS doesn’t load. On one occasion it the status bar did load but all I got was a black screen and a beach ball.

    I’ve tried:
    • Booting into Safe Mode
    • Booting into Recovery Mode
    • Booting into Internet Recovery Mode
    • Resetting SMC & PRAM
    All unsuccessfully

    I’ve also tried booting in Verbose and Single User Mode. When booted in Verbose the screen was moving quickly with text, so couldn’t get a photo on my iPhone but it was reporting corruption to files :(

    This is a photo from Single User Mode boot, again mentioning corruption to files.

    [​IMG]

    Everything I’ve tried so far has been unsuccessful to get it to successfully boot.

    Anyone have any ideas?
     
  2. ChrisD.

    Capodecina

    Joined: Sep 20, 2006

    Posts: 23,342

    Probably a knackered disk. Can you boot into single user and access command line?
     
  3. Valo

    Mobster

    Joined: Oct 18, 2002

    Posts: 3,492

    Location: Livingston

    Thanks for the quick reply. That’s what I was thinking as well :(

    Yes, I can access command line in single user. It’s sitting at local host root# etc, so I’m assuming that’s root access.
     
  4. ChrisD.

    Capodecina

    Joined: Sep 20, 2006

    Posts: 23,342

  5. Feek

    Commissario

    Joined: Oct 16, 2002

    Posts: 26,904

    Location: In the radio shack

    Looks like your drive is shagged.
    Get an external SSD, boot into recovery mode, install a fresh copy of the OS onto the external SSD, boot from that and restore your backup.
    Job done.

    And it'll be a lot quicker.
     
  6. Valo

    Mobster

    Joined: Oct 18, 2002

    Posts: 3,492

    Location: Livingston

  7. Valo

    Mobster

    Joined: Oct 18, 2002

    Posts: 3,492

    Location: Livingston

    Thanks for the advice Feek. May well need to go down in the short term.

    Would there be anything stopping me replacing the mechanical drive with an internal SSD and fusing that with the existing onboard 128GB flash, creating a single SSD fusion drive?
     
  8. Quartz

    Sgarrista

    Joined: Apr 1, 2014

    Posts: 8,446

    Location: Aberdeen

    Last edited: Nov 8, 2019
  9. Feek

    Commissario

    Joined: Oct 16, 2002

    Posts: 26,904

    Location: In the radio shack

    Not in theory, no but is there any real point in re-using the old SSD as it's another point of failure. If you meld that into a new Fusion drive then if it fails, you're back to square one. It's a desktop machine, I think I'd be happy running an external drive.
     
  10. Quartz

    Sgarrista

    Joined: Apr 1, 2014

    Posts: 8,446

    Location: Aberdeen

  11. Valo

    Mobster

    Joined: Oct 18, 2002

    Posts: 3,492

    Location: Livingston

    The next problem I have is the ability to do the repair. There was a time that I could do this myself, and used to! I’m a wheelchair user (tetraplegic through a spinal cord injury) so I have very limited hand function.....there is no chance I can do this myself now :(

    Obviously with the age of the machine any Apple Care has long expired. The machine is perfectly serviceable, runs Catalina great! I would only consider replacing it when Apple finally delivers a much needed redesign.

    Does anyone know of or even better recommend a company that could carry out the repair/upgrade?
     
  12. Quartz

    Sgarrista

    Joined: Apr 1, 2014

    Posts: 8,446

    Location: Aberdeen

    Your local Apple shop should be able to do this for you - for a fee.
     
  13. Valo

    Mobster

    Joined: Oct 18, 2002

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    Location: Livingston

    Really don’t want to go to Apple for this. The cost will be absolutely absurd more than likely.
     
  14. Feek

    Commissario

    Joined: Oct 16, 2002

    Posts: 26,904

    Location: In the radio shack

    If you use an external drive, there’s no cost involved. Plug it in and away you go ;)
     
  15. Valo

    Mobster

    Joined: Oct 18, 2002

    Posts: 3,492

    Location: Livingston

    Would the performance of the machine not suffer being plugged in and reliant on USB?
     
  16. Quartz

    Sgarrista

    Joined: Apr 1, 2014

    Posts: 8,446

    Location: Aberdeen

    Yes, wouldn't it crawl?
     
  17. Feek

    Commissario

    Joined: Oct 16, 2002

    Posts: 26,904

    Location: In the radio shack

    You have four USB3 ports and two Thunderbolt 1 ports. Performance via either of those won't be an issue.
     
  18. GW1970

    Gangster

    Joined: Nov 16, 2012

    Posts: 402

    I had the same issue a while ago and Upgraded the disc to an SSD which is simple enough
     
  19. dirtybeatfreak

    Mobster

    Joined: Jun 25, 2006

    Posts: 3,959

    Location: Eastbourne

    What version OS are you on? If High Sierra (10.13) or lower, get yourself a copy of Disk Warrior and run that. It wont work on Mojave and above as it cant rebuild the AFS file structure these newer versions use.
     
  20. Valo

    Mobster

    Joined: Oct 18, 2002

    Posts: 3,492

    Location: Livingston

    Thanks for the idea but I was running the latest build of Catalina when the disk failed.

    I’m just back from a trip to Glasgow to drop of my iMac with a well reviewed independent Apple repair company.

    They are going to remove the fusion drive (both the mechanical drive and the existing 128GB PCI-E SSD) and replace it with a 1TB SSD.

    All being well I should get it back at the end of the week.