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  1. #1
    Help with diagnosis of iMac
    Hi everyone,

    Hoping someone can help me. My iMac just crashed a week ago and I reformatted the drive and reinstalled OS High Sierra.... and itís been giving me problems ever since...

    Now whenever I use the creative cloud apps, they take forever to open up and the computer is just generally not as efficient as it used to be.

    Prior to the crash, the fan would be going super fast/ loud (for a while thatís been happening for a few months) so Iím thinking it maybe a hardware issue?

    Since the reformat, I havent even heard the fan... just sometimes clicking sounds...like itís trying to do something but canít.however Iím not having issues installing things... and when I do a verify disk it says it looks ok. At this point, im able to log in but eventually will just lock up randomly and then I have no choice but to turn it off by clicking the power button in back.

    Oh and Iíve seen the null symbol displayed (the circle with a diagonal bar inside it) a couple times when trying to load it back up. But if I do cmd r and go through the disk Utility it usually takes care of it.

    Here are the specs of my system:

    27inch iMac Late 2012
    3.2GHz quad-core Intel Core i5 processor
    32GB RAM

    Since I need a functional computer for my work (Iím a freelance designer), I had to get a new iMac... but would like to try and fix this one if I can... or at least use it as a display.

    Any help or advice would be greatly appreciated.

  2. #2
    Help with diagnosis of iMac
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
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    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, Numerous iPods, Mojave
    Rep Power
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    Welcome to our forums.

    It does sound like a hardware problem, possibly with the drive. We need more info about what type of drive is installed in your iMac. Is it a Fusion drive or a hard drive?

  3. #3
    Quote Originally Posted by chscag View Post
    Welcome to our forums.

    It does sound like a hardware problem, possibly with the drive. We need more info about what type of drive is installed in your iMac. Is it a Fusion drive or a hard drive?
    Hey thanks for the response... itís a 1tb hard drive.. not fusion

  4. #4
    Help with diagnosis of iMac
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    59,047
    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, Numerous iPods, Mojave
    Rep Power
    53
    Okay, thanks for the additional info. Disk Utility does not always give a complete picture of problems on a hard drive. I recommend downloading the "DriveDX" application and run it to do a complete including SMART check of the drive. Let us know.

  5. #5
    Help with diagnosis of iMac
    lclev's Avatar
    Member Since
    Jul 24, 2013
    Location
    Ohio (USA)
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    Your Mac's Specs
    2017 13" MBPro, 2010 MacPro, iPhone Xs Max
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    I am betting on a failing hard drive.

    Lisa
    Recommend using Onyx to clean your Mac.
    If you have been helped, please add to their reputation by clicking on the icon in the lower left hand corner of the post.

  6. #6
    Quote Originally Posted by chscag View Post
    Okay, thanks for the additional info. Disk Utility does not always give a complete picture of problems on a hard drive. I recommend downloading the "DriveDX" application and run it to do a complete including SMART check of the drive. Let us know.
    Hereís a photo of results from test
    Let me know if you want to see something else... looks like HD failure, right?

    If thatís the case, how come Iím still able to log on
    7CA75206-5FBD-484C-BFBE-A14BC27313F7.jpeg

  7. #7

  8. #8
    Help with diagnosis of iMac
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    59,047
    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, Numerous iPods, Mojave
    Rep Power
    53
    Yes, it's a failing hard drive. Not completely failed yet but definitely not safe to use any more. Back up your data as best you can and prepare to replace that hard drive.

  9. #9
    Quote Originally Posted by chscag View Post
    Yes, it's a failing hard drive. Not completely failed yet but definitely not safe to use any more. Back up your data as best you can and prepare to replace that hard drive.
    Thanks! All my data was backed up actually the HD was already erased and everything reformatted...since I couldnít even log on when it first crashed..

    So since the HD is shot and itís obviously not worth getting a new one... I would like to use it as an extra display monitor... can I still do that? If so how can I do that without having to use the HD?

  10. #10
    Help with diagnosis of iMac
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    59,047
    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, Numerous iPods, Mojave
    Rep Power
    53
    The monitor on that particular iMac can not normally be used as a separate display since there is no video input. There was an app called "ScreenRecycler" but it appears the developer has discontinued it. If you can find a copy of it, that might work to use your iMac as a spare monitor.

  11. #11
    Help with diagnosis of iMac
    lclev's Avatar
    Member Since
    Jul 24, 2013
    Location
    Ohio (USA)
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    2017 13" MBPro, 2010 MacPro, iPhone Xs Max
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    Hey - the old "girl" might still have some life left in her yet. Put an SSD in her and you will see a whole new computer. You would see a huge speed increase from the SSD> Of course, I would do that as I like tinkering and repurposing them.

    Of course - it is a bit difficult to do! iMac Intel 27" EMC 2546 Hard Drive Replacement - iFixit Repair Guide

    Lisa
    Recommend using Onyx to clean your Mac.
    If you have been helped, please add to their reputation by clicking on the icon in the lower left hand corner of the post.

  12. #12
    Help with diagnosis of iMac
    pm-r's Avatar
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    Oct 16, 2010
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    but would like to try and fix this one if I can...

    That iMac has both two Thunderbolt ports and Four USB 3.0 ports so it wouldn't cost very much to add and use an external drive that would work with with either of the various ports.


    - Patrick
    ======

  13. #13
    Quote Originally Posted by pm-r View Post
    That iMac has both two Thunderbolt ports and Four USB 3.0 ports so it wouldn't cost very much to add and use an external drive that would work with with either of the various ports.


    - Patrick
    ======
    Thatís what Iím thinking of doing. I have an external HD that Was sent to me with my backup... can I use that?

    Lisa: i wish I felt confident enough to replace it but Iím sure Iíll break something in the process lol

  14. #14
    Quote Originally Posted by chscag View Post
    The monitor on that particular iMac can not normally be used as a separate display since there is no video input. There was an app called "ScreenRecycler" but it appears the developer has discontinued it. If you can find a copy of it, that might work to use your iMac as a spare monitor.
    Are you sure? I found a help guide on the Apple site that says otherwise - I can use Target Display Mode apparently with this one as long as I can connect them both

  15. #15
    Help with diagnosis of iMac
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    59,047
    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, Numerous iPods, Mojave
    Rep Power
    53
    Target display mode is different from using the iMac just as a spare monitor. Go over what Target Display mode does and see if your iMac qualifies. If you can operate that way, then that may work for you. Let us know.

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