No sound on my 21.5inch, mid2011 imac bootcamp running windows10

Question

Level 1

5 points

No sound on my 21.5inch, mid2011 imac bootcamp running windows10

after installing windows10 (upgrade win7) on my 21.5 inch mid 2011 imac for the first time everything was ok (including sounds),

after losing my system and have to re-install directly windows 10 ISO file, everything went ok except for no sound,

i tried almost everything over days, that included re-install bootcamp 5.1.5 (same i used before), then downloaded windows support software from bootcamp assisstant on my 10.9.5 OSX, many cirrus drivers (and realtek), windows troubleshooter, device manager, etc .. still no sound.

iMac, Windows 10

Posted on Jun 18, 2018 3:35 PM

Reply

Answer 1

Loner T

Level 9

59,546 points

Jun 19, 2018 8:53 AM in response to ahmadmsallam

When you upgraded from W7 to W10, the W7 Audio drivers were 'grandfathered' and worked in W10. A clean installation of W10 no longer has the correct Audio drivers for a 2011 iMac. Is it possible to install W7 and upgrade to W10?

Reply

Answer 2

Loner T

Level 9

59,546 points

Jun 22, 2018 9:19 AM in response to ahmadmsallam

The 2011 Macs expose Audio hardware using a simulation layer called CSM-BIOS. Since W10 is not officially supported, you can use W8.1 in BIOS mode and install it, and then upgrade to W10.

Reply

Answer 3

Loner T

Level 9

59,546 points

Jun 18, 2018 4:38 PM in response to ahmadmsallam

On the Windows side, run msinfo32 and post the value of BIOS Mode.

Reply

Answer 4

Loner T

Level 9

59,546 points

Jun 19, 2018 11:04 AM in response to ahmadmsallam

There are no W10 drivers for the 2011 Mac models. There is no other solutions for your Audio issue.

Reply

Answer 5

Loner T

Level 9

59,546 points

Jun 20, 2018 11:57 AM in response to ahmadmsallam

You cannot install W7 drivers (which are unsigned) on W10 as it requires driver signatures. You can try disabling this and trying to install the drivers.

Reply

Answer 6

Loner T

Level 9

59,546 points

Jun 20, 2018 12:06 PM in response to ahmadmsallam

See How to Disable Driver Signature Verification on 64-Bit Windows 8 or 10 (So That You Can Install Unsigned Drivers) .

Reply

Answer 7

Loner T

Level 9

59,546 points

Jun 24, 2018 11:46 AM in response to ahmadmsallam

Can you post a screen shot of Windows Device Manager and expand the Audio devices and post a screen shot?

Reply

Answer 8

Loner T

Level 9

59,546 points

Jun 25, 2018 1:54 PM in response to ahmadmsallam

Do you have a 'before' image with the Audio Inputs/Outputs expanded?

Reply

Answer 9

ahmadmsallam Author

Level 1

5 points

Jun 22, 2018 8:09 AM in response to Loner T

first im grateful for LonerT interaction and trying to help .. 2nd i couldn't solve this problem .. not here, not with windpws support nor with searching some different sites support .. so i have to accept my silent windows mac and till some intelligent dramatic solutions appears from heaven!

thank you LonerT for your time and effort.

Reply

Answer 10

ahmadmsallam Author

Level 1

5 points

Jun 24, 2018 10:25 AM in response to ahmadmsallam

after lots of searching .. bla bla blaah .. this simple sequence solved it (although i confess i don't know what it did exactly)

Follow this and it should solve your problem.

Go to start and select Command Prompt (Admin\run as administrator) at the prompt type:-

net localgroup Administrators /add networkservice

press enter then type:

net localgroup Administrators /add localservice

press enter then type:

exit

press enter and restart your computer

Reply

Answer 11

ahmadmsallam Author

Level 1

5 points

Jun 19, 2018 8:44 AM in response to Loner T

first i have to thank you for your reply ..

Reply

Answer 12

ahmadmsallam Author

Level 1

5 points

Jun 19, 2018 8:58 AM in response to Loner T

isn't there easier solutions? im not that relaxed expert, nor that patient for a fresh win7 installation then upgrade .. actually i waited months to install this windows10!

Reply