SSD appears in start up disk preference but won't boot

Discussion in 'macOS High Sierra (10.13)' started by whapweasel, Mar 15, 2018.

  1. whapweasel macrumors newbie

    Joined:
    Mar 14, 2018
    Location:
    England
    #1
    I have a 2017 27’ Imac with a 500gb SSD formatted in APFS , OS High Sierra 10.13.3


    With my previous iMac (graphic card failed) I used an external 250gb SanDisk SSD formatted with Mac OS extended journal.

    This SSD was bootable using OS X Yosemite.

    When I connect this external SSD to my new iMac it appears in the start up disks preference but when I try to start up from the external SSD the screen goes dark and the computer freezes.

    The reason I want to start up from this external SSD is because it has a version of Adobe Photoshop which is not compatible with High Sierra and Photoshop is very expensive.

    Could this be a formatting issue and /or a High Sierra Issue ?

    Thank you for any assistance.
     
  2. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #2
    This is your problem. A 2017 iMac will not run on Yosemite.
     
  3. MarkC426 macrumors 6502a

    Joined:
    May 14, 2008
    Location:
    UK
    #3
    Which version of Photoshop are you using?
    I have CS5 Extended running in Sierra.
     
  4. whapweasel thread starter macrumors newbie

    Joined:
    Mar 14, 2018
    Location:
    England
    #4
    It was CS4
     
  5. MarkC426 macrumors 6502a

    Joined:
    May 14, 2008
    Location:
    UK
  6. BLUEDOG314 macrumors 6502

    BLUEDOG314

    Joined:
    Dec 12, 2015
    #6
    Might be able to fire up migration assistant and have it pull over the app for you. Haven't done migration assistant after initial setup in some time but I think it'll work. You may have to end up with an extra random user account though.
     

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5 March 15, 2018