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'Missing Operating System'

1345 Views 5 Replies Latest reply: Feb 15, 2013 9:13 AM by Fourforks RSS
Fourforks Calculating status...
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Feb 15, 2013 8:02 AM

I have a new 27' iMac which of course does not have an internal superdrive.  After Bootcamp partitione dthe drive, the screen blanks I there is a message to press any key, followed by a message that the operating system is missing.  I have looked a around on the internet and see that Bootpicker can be a cause of this, but I do not have it installed.  I have also seen some posts that Windows 7 cannot be installed from an external drive, although some posts say that it can.  What do I do?

MacBook Pro (15-inch, Mid 2012), OS X Mountain Lion
  • mende1 Level 10 Level 10 (89,470 points)
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    Feb 15, 2013 8:37 AM (in response to Fourforks)

    Your Mac doesn't detect your Windows installation drive.


    You can install Windows from a USB drive if you are using a Mac without a built-in SuperDrive, so you can use it. Hold the Option (Alt) key while your Mac is starting until you see the bootable volumes on the display. Then, just select your external drive to start the Windows installation

  • GeekBoy.from.Illinois Level 4 Level 4 (2,730 points)
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    Feb 15, 2013 8:43 AM (in response to Fourforks)

    If your Mac shipped from Apple without a SupuerDrive, then the BootCamp assistant should give you the option to create an installable USB drive form your Windows ISO file.  If your system shipped from Apple with a SuperDrive, then the Boot Camp Assistant expects you to use it for the installation.

  • mende1 Level 10 Level 10 (89,470 points)
    Currently Being Moderated
    Feb 15, 2013 9:10 AM (in response to Fourforks)

    After the first Windows restart (during the installation), if your Mac doesn't start automatically in Windows, you can start into OS X, open System Preferences > Startup Disk, and choose your Windows volume to start your Mac.


    Then, if you want to start into OS X, just hold the X key while your Mac is starting


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