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  1. #1
    Why unable to boot from DVD after Windows reinstallation
    Hello,

    I am the very happy owner of a late 2009 27inch iMac (model 11,1). I installed bootcamp and Windows 7 a year ago. I upgraded to Windows 10 this year. Following a software install issue, I had to reinstall W10. This never succeeded. Since then I did many tests to no avail and ended by deleting all partitions in the hope of starting anew. But now I am stuck, it still refuse to start up (grey/black screen after the initial white screen). The situation is the following :
    - If I boot with the "C" key pressed (boot from Windows DVD), the iMac enters a cycle of Windows 10 diagnostic and reparation that concludes with a reboot after a few screens and questions, and then back to square one with the grey/black screen
    - If I boot with the "D" key pressed (Hardware Diagnostics), nothing happens. I tried to boot (D) from the Apple Application Disk in order to launch the Hardware Diagnostics, nothing happens
    - If I boot with "Alt" key pressed, the only option displayed by the Startup Manager is "EFI Boot". If I insert my Windows install disk or my Mac OS install disk they do not appear as boot options
    - Nothing happens when I try to boot with Verbose mode, Safe mode, etc. I believe that I tried all of Mac OS boot options without any success

  2. #2
    What version of OS X was running on this Mac? When you said you deleted all partitions, did you just delete the Windows partition or actually all partitions? If you deleted all partitions, then you've lost the ability to boot into OS X in any shape. This shouldn't prevent you from booting from supported media though. Not sure what's happening there.
    --
    Regards
    ...Ashwin


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