macbook air prohibitory sign usb boot

Discussion in 'MacBook Air' started by mrmadrid, Sep 2, 2015.

  1. mrmadrid macrumors newbie

    Nov 3, 2014
    Im a new user of mac os

    Hi All,

    I have a Macbook Air A1466. It was working fine, What I did is Erased the HDD from recovery boot in Disk Utilities.

    Now when I want to rebuild it Im this getting this prohibited sign.

    Command + S shows me this

    This version of mac os x is not supported on this platform!

    I tried two bootable usbs with different versions Yosemite and mountain lion on USB

    I checked the both USBs on macbook pro setup is loading

    but on the Macbook Air 1466 either It does not show o Prohibited Sign.


  2. Significant1 macrumors 6502

    Dec 20, 2014
    What version was installed earlier.if it was one of the latest versions you should be able to use internet recovery. Try pressing alt+cmd+r during boot up.
  3. Significant1 macrumors 6502

    Dec 20, 2014
  4. mrmadrid thread starter macrumors newbie

    Nov 3, 2014
    Thanks for the both reply. The macbook is a one of the friend. Internet Recovery is the last option I want to use.

    I also did the pram reset for the same it's not working.

    I just want to make Bootable usb of mac with latest os possible to load it. That's actual concern.

    If this is the latest os then what os x should I try to burn on usb. Please help

  5. Significant1 macrumors 6502

    Dec 20, 2014
  6. mrmadrid thread starter macrumors newbie

    Nov 3, 2014
    I wanted to built a re installation tool that's the need as I have almost major versions of os x on usbs. My basic work is related to installations and troubleshooting.
  7. Significant1 macrumors 6502

    Dec 20, 2014
    I just did a google on the number you gave Mac-937cb26e2e02bb01. That is a 2015 Macbook Air motherboard. Mac's does not support OsX older than the version they where introduced with. So Yosemite 10.10.3 (maybe 10.10.2) or newer is likely only supported.

    Did you try booting into recovery (CMD+R at boot) instead of a USB?
    Even though you deleted the disk, you likely did not delete the hidden recovery partition. If you really did delete all partition, CMD+R should automatically fall back on internet recovery, but you can also trigger it manually by ALT+CMD+R.

    If you still want a USB-installer. The Apple way doing it, is to download the latest Yosemite installer from App-store on another machine and use Apple's build in Command line tool:
  8. rigormortis, Sep 4, 2015
    Last edited: Sep 4, 2015

    rigormortis macrumors 68000


    Jun 11, 2009
    the problem was you probably erased the entire hard disk, including the recovery partition, and not just the main partition as you were supposed to.

    choices, as they were already given you are
    1. internet recoevery. there is no bad reason for doing this, if your computer came with yosemite.
    2. making that usb boot from the intaller from the app store. (this is a better solution because you can save it for later and not have to download 4 to 6 gigs each time )
    3. going to the apple store and having them reinstall os x for free..

    welcome to the new world of mac , where you have multiple ways of installing os x, and not having to worry about having to pay geek squad $150 or calling microsoft for a new license key.

    the boot key as mentioned should to be a recent version, like 10.10.3 to 10.10.5

    back in the day, before os x yosemite came out.. or maybe even mavericks came out...
    im not sure when... the preferred way was to go to the apple store to have a genius install os x on your computer. , but why do you say this??? because the genius would ask you, "did you have ilife?"
    and you could say yeah sure i did wink wink, and they would give you free ilife instead of you having to pay $32 or whatever it is now. but i think everyone gets ilife for free now

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