Tried many things but nothing seemed to work installed all the drivers, read all threads about this issue in this forum but nothing worked ... Found an article but it was very long and confusing, if you know a solution to this please let me know thanks <3

I used a flash drive instead of a DVD to install Windows.

  • What size screen? Nov 27, 2019 at 3:19
  • 21.5 inch screen Nov 27, 2019 at 6:04
  • I asked because I am currently using a 2.15 inch 2.5 GHz Mid 2011 iMac. I do not remember having any problems with the auto drive when I had Windows 8.1 installed. Have you consider upgrading to the current version of Windows 10? I used to have Windows 10 installed and I did not have any problem with the audio driver. Nov 27, 2019 at 7:40
  • Yes I did before, infact I installed windows 8.1 over 5 times and never worked... Nov 29, 2019 at 23:12
  • Would you be willing to try Windows 10? You can download the iso and install for free. However, if you wish to continue to use Windows 10, then you would have to buy a license. Nov 29, 2019 at 23:28

1 Answer 1


In 2012, Apple starting switching over from DVD installs of Windows to flash drives. In 2015, Apple again switched to installs of Windows where only the Windows ISO file was required. Your have a 2011 Mac and therefore were only suppose to install up to 64 bit Windows 8.1 by using a DVD. While by 2011 the industry had converted from legacy BIOS booting of Windows to the modern EFI boot method, Apple did start converting until 2012. When a High Sierra was installed on your Mac, the firmware was upgraded to allow EFI booting of a Windows 10 installer from FAT32 and ExFAT formatted flash drives.

Unfortunately, the Boot Camp Support Software for your model Mac contains drivers for the legacy BIOS booting of Windows. Therefore, if you attempt to install an EFI booting Windows you may encounter problems such as the audio not working properly. The same should also be true when installing Windows 8.1

No Mac, regardless of model year, can BIOS boot from a flash drive.

In my opinion, Windows 8 and 8.1 were terrible versions of Windows. Therefore, you should consider installing Windows 10. Since the Window Support Software drivers are designed for a BIOS booting Windows, you should only install Windows to BIOS boot.

If you use a DVD to install Windows, then you should choose to BIOS boot from the DVD. This will automatically select Windows to be installed to BIOS boot. If installing the current version of Windows 10, then you will need a double layer DVD (DL).

If you choose to use a flash drive, then you can only EFI boot from the flash drive. The Windows installer will by default require you to install Windows to EFI boot. Instructions on how to install Window 10 to BIOS boot are given in the accepted answer to the question How to install Windows 10 into a 2011 iMac without using the Boot Camp Assistant, an optical (DVD) drive or third party tools?

  • Okay but Windows 8 was bad not 8.1 though, and also the highest version bootcamp will support is 8.1 so I have to install Windows 8.1 then upgrade to Windows 10... Thank you for your help... Nov 30, 2019 at 8:02
  • Oh and also when trying to install Windows 7 I get a black screen upon bootup.. Nov 30, 2019 at 8:04
  • The drivers provided by Apple work with Windows 10 whether you do a clean install or upgrade from a previous version. However, I there does appear to be one file (bootcamp.msi) that no longer will works with the 1903 release of Windows 10. I have not checked to see what happens with the 1909 release. Nov 30, 2019 at 8:59
  • There is EFI booting and UEFI booting. The industry switch to UEFI booting of Windows in 2011. Macs EFI boot OS X and macOS. The EFI standard was developed by Intel and adopted by Apple long before 2011. UEFI was developed from the Intel EFI standard. A 2011 iMac firmware is EFI compliant enough to boot OS X and macOS. Macs officially became enough UEFI compliment to boot Windows starting in 2012. You Mac is just one year to early and therefore has problems EFI booting Windows 7 from a flash drive. Nov 30, 2019 at 9:17
  • Okay, thank you for your help really appreciate it.. Nov 30, 2019 at 9:26

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