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  1. #1


    Member Since
    Mar 29, 2011
    Posts
    11
    Unhappy HELP Please..... No bootable device screen on win/osx setup iMac.
    I have done something to my iMac that I knew would not work/or a gamble but still gave it a try!

    I have OS X Lion and Windows 7 64bit (Bootcamp). The Windows partition in bootcamp was only 100GB so I tried to access more storage by creating a partition from the current OS X partition but format it as MS Fat. I didn't format OS X partition.

    The IMac is setup to boot in Windows. After performing this partition in disk utility on OS X i rebooted the machine and got a black screen with message
    " No bootable device --- insert boot disk and press any key "


    O'pooop!!!

    I have tried holding the option keys on boot to access boot volume screen. No luck. Just goes to the black screen with boot device message.

    What would you advice the best course of action.

  2. #2

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,541
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    I hope you made backups before you went to playing with your partitions.

    1. Try a PRAM reset - discovered by the op himself.

    2. Boot to your bootable SD! or CCC backup
    open Disk Utility and partition the internal drive to a single partition
    open SD! or CCC and backup to your internal drive
    then boot to your internal drive
    open up Boot Camp Assistant and create your Windows partition and install Windows
    boot to Windows
    install Boot Camp drivers
    use your Win 7 backup
    might be able to do this in a couple of hours

    3. Boot to the Lion USB key you made
    open Disk Utility and partition the internal drive to a single partition
    install Lion
    have it use your Time Machine backup to restore your data
    open up Boot Camp Assistant and ...
    again - probably a couple of hours

    4. You don't have any backups -
    Head out and buy yourself another hard drive - either an external or use this as an excuse to upgrade your internal drive
    boot from your Snow Leopard disc that shipped with your machine or the retail one whichever you have
    install Snow Leopard on the new drive - external or internal whichever you decided to get
    update Snow Leopard to 10.6.8
    install Lion from the App Store
    then try to salvage your data from your current drive if it is still readable, etc.
    a whole bunch of time

    5. You don't have any backups and you lost your original OS X discs

    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  3. #3


    Member Since
    Mar 29, 2011
    Posts
    11
    Just an update that may help people in a similar position:

    Hold down P, R, Alt and Cmd. Turn on Mac whilst holding these keys down. Boots up into Mac OS X.

  4. #4


    Member Since
    Mar 29, 2011
    Posts
    11
    thanksk for the reply 'bobtomay'. Managed to sort it with the key combo access.

  5. #5

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,541
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    Good to know WaveRider - didn't even think about a PRAM reset in this scenario. Thanks.

    Going to edit the above in case someone else runs into this and stops reading at my post.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  6. #6


    Member Since
    Mar 29, 2011
    Posts
    11
    Only problem is i get the boot error message if trying to restart in Windows. Looks like i need to delete the bootcamp partition and re-install win 7. O'well, could have be worst!

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