iMac not booting from USB

Discussion in 'iMac' started by Freeks, Feb 13, 2017.

  1. Freeks macrumors regular

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    Jul 2, 2009
    #1
    I just got latest iMac and tried boot from my old laptop ssd via USB dock and all i get is grey screen with error sign. Same ssd boots just fine with two laptops, but not with iMac.

    I tried also boot from usb installer but get same error. Any ideas? I have never seen that error before.
     

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  2. maflynn Moderator

    maflynn

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  3. briloronmacrumo macrumors 6502

    briloronmacrumo

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    #3
    Booting from an external device ( such as USB stick ) will trigger the password prompt if the iMac's firmware password is set but your screen shot doesn't show that prompt. Have you tried booting with the OPTION key held down? Presumably results will be the same but if it shows boot drives it could be a clue.
     
  4. CoastalOR, Feb 13, 2017
    Last edited: Feb 13, 2017

    CoastalOR macrumors 68000

    CoastalOR

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    #4
    The minimum OS that will run the "latest iMac" is El Capitan (10.11). If the OS on your external old laptop ssd via USB dock or USB installer is earlier then 10.11 then it can not boot your new iMac.
     
  5. nambuccaheadsau macrumors 6502a

    nambuccaheadsau

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    #5
    I would not be using an older PowerBook, particularly if a PowerPC model anywhere near the new iMac.
     
  6. Freeks thread starter macrumors regular

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    Jul 2, 2009
    #6
    Thanks for the replies!
    OS in SSD is 10.11 same as in iMac. If i boot with option-key i can see the ssd as boot option, but when i click it i get that error screen. It never advances to the point where password is entered.

    It does the same with 10.11 installer USB stick. So i could not even do clean install if i wanted.
     
  7. Fishrrman macrumors G4

    Fishrrman

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    Feb 20, 2009
    #7
    Something to try:

    Clone the contents of the non-booting USB flash drive to ANOTHER flash drive using either CarbonCopyCloner or SuperDuper.

    See if the SECOND flash drive does the same as the first..
    (i.e., eliminate the physical flash drive as "the problem")

    Another (possible) workaround:
    You'll need an external drive.
    Using a DIFFERENT Mac, do a "clean install" of the OS onto an empty drive.
    Boot from the new install, set it up with a temporary account.
    Put CarbonCopyCloner onto the drive, as well.
    Now, connect it to the iMac.
    Will it boot?
    If it does, ERASE the iMac's internal drive and (again) use CarbonCopyCloner to clone the contents of the external drive to the iMac's internal drive...
     
  8. CoastalOR macrumors 68000

    CoastalOR

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    #8
    Has the old laptop ssd via USB dock and/or the usb installer successfully booted another Mac?
     
  9. Freeks thread starter macrumors regular

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    Jul 2, 2009
    #9
    yes it works with old MBP 2008.
    --- Post Merged, Feb 14, 2017 ---
    I have USB drive so i will try to copy that drive. But as the USB stick didn't work i don't think it will work with another USB drive. Let's see after SuperDuper copies and i can try it...
     
  10. Freeks thread starter macrumors regular

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    #10
    So i cloned the SSD to USB drive with CCC, but it's still no go. I can choose to boot from it, but it boots to error screen. I know now it's not the boot HW. It's something wrong with the iMac.

    Have anyone else had this error?
     
  11. Fishrrman macrumors G4

    Fishrrman

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    Feb 20, 2009
    #11
    In your original post, you said it was "the latest" iMac -- which I'll assume is a late-2015.

    Will it boot at all?
    From any source?
     
  12. Freeks thread starter macrumors regular

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    Jul 2, 2009
    #12
    Yes, it's 2015 latest iMac.

    I bought new Seagate USB3 drive and clone the boot disk and it don't work. Same problem with all drives with that backup. I probably need to contact Apple and ask why this iMac can't boot 10.10 backup drive.

    I will do test and clone internal 512GB SSD to the new USB Drive and try if that boots.
     
  13. nambuccaheadsau macrumors 6502a

    nambuccaheadsau

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    #13
    It can't because it cannot find drivers. As a rule of thumb no going backwards from the OS the iMac was released with.
     
  14. Freeks thread starter macrumors regular

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    #14
    Not the case here. Same drives boots in 2015 Macbook. It's also same OS version. But as soon as i get the internal SSD cloned i can see if that's the case. Internal SSD is pretty damn fast! So cloning to new USB3 drive goes quite fast.
     
  15. CoastalOR macrumors 68000

    CoastalOR

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    #15
    The 2015 iMac can't boot Yosemite (10.10), so don't bother to waste your time asking Apple. I say again, as I said in post #4, the lowest OS is El Capitan (10.11). I realize in your post #6 you said OS 10.11, but on post #12 you said 10.10. The misinformation leads to a lot of confusion.
     
  16. Freeks thread starter macrumors regular

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    Jul 2, 2009
    #16
    Sor
    Sorry it was my typo. I meant 10.11.

    But did try to clone internal SSD and boot from that and it worked. Workaround is to ditch this iMac and get iMac that can boot that drive. I have migrated from mac to mac since 2006 and this time i wanted fresh start. I don't want install everything i had on laptop. But i have several projects that will not open properly in imac.
     
  17. Fishrrman macrumors G4

    Fishrrman

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    #17
    OP wrote:
    "But did try to clone internal SSD and boot from that and it worked. Workaround is to ditch this iMac and get iMac that can boot that drive"

    Hmmm....
    You're saying above that you HAVE a copy of the OS which WILL boot the iMac in question?

    If so, then USE WHAT WORKS.
    Stop trying to boot with copies of the OS that DON'T work...
     
  18. CoastalOR macrumors 68000

    CoastalOR

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    #18
    Let's see if I understand. You have a external USB drive that is a clone of your 2008 MBP running 10.11.6. You want to use the USB clone to boot your iMac so you can run your projects without having to install the apps/projects on your new clean iMac.

    If I am correct in my understanding then you could try booting from your working cloned iMac external drive, connect the clone of your 2008 MBP, run the Migration Assistant app to migrate the apps/files etc. to the iMac clone. That might work to give you external bootable drive with the apps and projects you need without installing them on your new iMac.
     

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