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iMac mid 2011 cannot install audio driver

I have installed Windows8.1 on my iMac mid 2011.

During installation recommended BootCamp 5.1.5621 Windows crashes with bluescreen.

I have installed all drivers manually but don't know which audio drivers must be installed on my iMac.

I tryed to install realtek and Cirrus drivers.

In device manager i have 2 Controller High Definition Audio(Microsoft)

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iMac (27-inch Mid 2011), Windows 8

Posted on Jun 12, 2015 4:48 AM

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Posted on Jun 12, 2015 5:45 AM

Your 2011 iMac is a preUEFI Mac, and EFI boot will not see devices correctly. This causes GPU and Audio to work incorrectly. For example, you may see the Intel GPU with EFI boot, which is not mean to be seen. Your Cirrus or Realtek Audio devices do not show up correctly.


You will need to remove the EFI Windows and install using the MBR/BIOS method if you want your sound to work properly.


Macs after Late 2013 support UEFI and can use EFI boot for Windows.

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Jun 12, 2015 5:45 AM in response to kew444

Your 2011 iMac is a preUEFI Mac, and EFI boot will not see devices correctly. This causes GPU and Audio to work incorrectly. For example, you may see the Intel GPU with EFI boot, which is not mean to be seen. Your Cirrus or Realtek Audio devices do not show up correctly.


You will need to remove the EFI Windows and install using the MBR/BIOS method if you want your sound to work properly.


Macs after Late 2013 support UEFI and can use EFI boot for Windows.

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Jun 12, 2015 5:36 AM in response to Loner T

manually using EFI Boot

BootCamp Assistent in my macos 10.9 creates BootCamp partition that windows detected as MBR partiotion.

I have used DiskUtility to make freespace to install windows.

This method of installation have worked on my macbook Pro with mac OS 10.10.

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Jun 12, 2015 8:12 AM in response to Loner T

It works!

I have recreated bootcamp partiotion using BootCamp Assistant.

Then i have installed Windows 81 chusing in mac bootmenu DVD-device marked "Windows" (NOT EFI dvd).

I have formatted Bootcamp partition during installation and have installed win81.

bootcamp 5.1.5621 Setup.exe have worked without errors.

Thank you!

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iMac mid 2011 cannot install audio driver

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