Level 1

12 points

No sound on 27 inch iMac Mid 2011 running Windows 8.1 on Botcamp

Hello! I just installed 8.1 on my Mac and everything went very well. Then only issue I found is the sound and the brightness. I try to turn down the brightness but nothing happens. The bar shows that it's going down but it isn't. The sound is also broken. When I try to turn up the sound, there is a circle with a cross with the volume icon. I tried many things to fix the sound issue. I tried downloading new drivers, updating drivers, etc. The brightness issue, I don't really care but it would be useful if we can fix it too. I talked to Microsoft about the sound problem and they said the only way to fix it is to get Windows 10. Unfortunately, my mid 2011 Mac does not support Windows 10 on boot camp. I'm in desperate need of the sound in windows so I need your help! Thanks!

Posted on Oct 15, 2017 8:28 PM

Top-ranking reply

Loner T

Level 9

59,536 points

Posted on Oct 16, 2017 5:46 PM

Does your built-in Optical drive function properly?

amytom12 wrote:

And oh, I forgot to mention. When I was installing Windows 8.1, I got a MBR table error and something about EFI's and GPT. I looked on YouTube and this guy said to go to terminal on my mac side and put some codes in. I don't know if this effects the sound.

Yes, it does. If you do not use the internal Optical drive and a DVD (or CD) to install Windows on your specific model and instead use a USB (or manually choose) EFI boot, the Audio devices are not exposed correctly. This is indicated by the current BIOS Mode being UEFI. On your specific 2011 model, it should be Legacy (or BIOS).

The only method to switch to BIOS mode, is to remove the current installation using Remove Windows from your Mac - Apple Support and then use a DVD in the Optical drive to install W8.1. The 'code' you were asked to input in Terminal removed the MBR, forcing a UEFI installation, and causing the Audio to malfunction.

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152 replies

amytom12 Author

Level 1

12 points

Dec 2, 2017 3:21 PM in response to Loner T

Okay.

amytom12 Author

Level 1

12 points

Dec 2, 2017 3:30 PM in response to Loner T

Okay, I booted into the Windows disk. Now I'm on the install screen, should I just follow the steps?

Loner T

Level 9

59,536 points

Dec 2, 2017 3:50 PM in response to amytom12

Did you choose the correct BOOTCAMP partition before you got to this screen?

amytom12 Author

Level 1

12 points

Dec 2, 2017 4:12 PM in response to Loner T

Not sure what you meant, but this is what I picked:

amytom12 Author

Level 1

12 points

Dec 2, 2017 4:19 PM in response to amytom12

Ok, I proceeded to enter the Product key and now I'm at the formatting screen. Do I just select "Drive 0 partition 4: W 8" and click on "Format"?

Loner T

Level 9

59,536 points

Dec 2, 2017 4:22 PM in response to amytom12

Yes, please click on Format and the Next button should be enabled.

amytom12 Author

Level 1

12 points

Dec 2, 2017 4:23 PM in response to Loner T

Okay, just did, now on the Installing Windows screen. It's loading.

Loner T

Level 9

59,536 points

Dec 2, 2017 4:33 PM in response to amytom12

Good to see it proceeding without any issues so far.

amytom12 Author

Level 1

12 points

Dec 2, 2017 4:49 PM in response to Loner T

Hmm, when it says the computer is going to restart, it just restarts into macOS and doesn't restart into Windows. When I boot back into windows, I have to do the whole install process again.

amytom12 Author

Level 1

12 points

Dec 2, 2017 5:03 PM in response to amytom12

Okay, nevermind. I'm on the Windows desktop now. How do I install the drivers now?

amytom12 Author

Level 1

12 points

Dec 2, 2017 5:46 PM in response to Loner T

Oh my gosh! Everything works now! Thank you so much! But one question, do I need my DVD with Windows 8.1 on it to boot into Windows or I don't need it?

Loner T

Level 9

59,536 points

Dec 2, 2017 6:09 PM in response to amytom12

Excellent. You do not need the DVD anymore, but I suggest you keep it in a safe place.

Please back up macOS, Windows and create a Windows System Restore point, to recover from any future issues.

amytom12 Author

Level 1

12 points

Dec 3, 2017 6:02 AM in response to Loner T

I don't have any important files on my mac. I don't care if I lose them or not. Do I still need to backup?

Loner T

Level 9

59,536 points

Oct 17, 2017 11:34 AM in response to amytom12

Run BCA, and you should only see two options - Download and Install. Insert the DVD, uncheck the Download box, and check the Install option, partition your disk and follow the prompts.

If you get an error message, please post a screen shot of the error, if possible.

amytom12 Author

Level 1

12 points

Nov 12, 2017 12:24 PM in response to Loner T

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No sound on 27 inch iMac Mid 2011 running Windows 8.1 on Botcamp