5 Replies Latest reply: Feb 15, 2013 9:13 AM by Fourforks
Fourforks Level 1 Level 1 (0 points)

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
  • 1. Re: 'Missing Operating System'
    mende1 Level 10 Level 10 (89,570 points)

    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

  • 2. Re: 'Missing Operating System'
    GeekBoy.from.Illinois Level 4 Level 4 (2,775 points)

    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.

  • 3. Re: 'Missing Operating System'
    Fourforks Level 1 Level 1 (0 points)

    The only thing is, that I am having to turn the mac off and then reboot into the Windows Disc everytime the installation restarts.

  • 4. Re: 'Missing Operating System'
    mende1 Level 10 Level 10 (89,570 points)

    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

  • 5. Re: 'Missing Operating System'
    Fourforks Level 1 Level 1 (0 points)

    I have tried to, but it goes to a black screen saying that the operating system is missing, even if I hold alt down.  I hav eto turn off the power, restart and select the start up disc.