No sound on Windows (OSX Mac Bootcamp)

I have Windows running natively on my MacBook Pro.
I am unable to hear sound.
I plugged headphones into what appears to be the earphone jack on the side of the MadBook Pro where the USB ports are. Still no sound.
I plugged a microphone into the USB port on the computer - and then plugged the headphones into the microphone jack. I can hear sound that way.

Lugging the microphone around is a nuisance. Any ideas on how to get sound to work through the computer speakers, or through the jack?
cornell256Asked:
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Eoin OSullivanConsultantCommented:
It could be a problem with the audio drivers for windows which are installed not being correct
1. Can you boot into OSX and confirm that the sound is working there?
2. What version of Windows have you installed?
3. What version of BootCamp are you using?

Check carefully your model of MacBook and which version of BootCamp and Windows are compatible
http://support.apple.com/kb/HT5634

OSX BootCamp comes with all the drivers required to enable Apple Hardware (audio, video, Ethernet, wifi etc.) for Windows 7 or 8.  You can download the various versions of the BootCamp Support Software here.
http://support.apple.com/downloads/#macoscomponents
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cornell256Author Commented:
Thanks - I will try this in the next few days and report back. Why can I hear sound through the microphone? If I can't fix the problem, I'd like to find an inexpensive lighter way to do this for when I travel - the Yetti microphone is quite heavy.
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Martin LissOlder than dirtCommented:
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cornell256Author Commented:
Thanks, Martin - no that is not the problem - I never have sound and there is no red light. I can't look at this for a few days due to a deadline but will report back.

I should mention, I have no sound at all on bootcamp - except when plugging headphones through the Yetti microphone. So without headphones - no sound.
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Martin LissOlder than dirtCommented:
Do you have sound set to Mute in Preferences?
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cornell256Author Commented:
I am not booted into Windows right now but can check at some point. However, since I can hear sound through the Yetti microphone (via a USB connection), doesn't that suggest sound would not be set to mute?
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Martin LissOlder than dirtCommented:
On my MAC I have a pair of external Bose speakers that have a touch-sensitive volume control and when I touch the center the sound is muted. If I plug my headphones into the volume control I can still here the sound.
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cornell256Author Commented:
I will go look right now - thanks for the idea. Actually, before I do that, where do I find preferences - it's Windows that controls it, right? (I have never touched preferences so doubt that is the issue but should check.)
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Martin LissOlder than dirtCommented:
Well "Pregerences" is a MAC thing but in Windoes the sound settings are somewhere in Contril Panel.
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Martin LissOlder than dirtCommented:
Oops "Preferences".
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Martin LissOlder than dirtCommented:
And Windows:(  Sure would be nice if the EE mobile app allowed one to edit their post so as to avoid embarrassment.
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cornell256Author Commented:
I went into Windows and verified that the speakers have up-to-date drivers and are "working correctly". Nothing is muted.

I forgot to check on versions, which I will post next time I am on Windows and can check. By the way, the Apple genius bar folks installed boot camp when I purchased the MacBookPro so I'm assuming things are compatible.

Sound on OSX works fine.
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Martin LissOlder than dirtCommented:
If you're not happy with Boot Camp you might look into at this list. I use Parallels which allows me to run OSX and Windows seamlessly side by side, although right now with Parallels' most recent release there's a small but annoying bug - Copy/paste from OSX to Windows drops the last character:(
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Eoin OSullivanConsultantCommented:
USB microphones and headphones come with their own drivers for windows and osx so that would explain why the microphone works but the headphone and microphone jacks do not

If you can confirm the model of MacBook Pro, and if the headphone and microphone jacks work under OSX then we can rule out hardware issues and focus on drivers and settings in Windows as the cause.
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cornell256Author Commented:
Thanks for the explanation, eoinosullivan - interesting.

I have a MacBookPro 7,1

Great, on to the next step in this interesting process!
I did find this article but it's very involved - maybe there's a faster way to sleuth this out.
http://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/no-sound-on-windows-7-installed-on-an-imac/af6e2f0f-fc46-487b-af0f-6299f115cbfe
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Eoin OSullivanConsultantCommented:
OK - Things are clearer now I know the MacBook Pro you have one of the 2010 models
http://www.everymac.com/ultimate-mac-lookup/?search_keywords=MacBookPro7,1

There is an inbuilt small microphone in the body of the laptop but these MacBooks have a only 1 audio jack which doubles as input (microphone) and output (headphones) which is quite unusual however in OSX you can switch the function of the port from input to output.
Explained more by Apple :  http://support.apple.com/kb/HT3625

The input requires a pre-amplified microphone as it is a line-level input and a normal microphone's output is far too low. You will need to use a microphone preamplifier. It is this reason that Apple recommend using a USB microphone provided it specifies that it uses CoreAudio.

As far as I can tell it should be possible to at least get the internal speakers to work in Bootcamp so that you can hear sound when running Windows. I'm not sure what version of BootCamp you're using but the internal speakers and microphone use CirrusLogic drivers as far as I can tell and if you follow the step by step guide - Solution 2 on the link below you can extract the cirrus audio drivers from the BootCamp 2.2
http://blog.deep-analytics.com/2010/01/bootcamp-30-macbook-pro-sound-and.html

There are a few postings that indicate that BootCamp 3.1 should also contain the drivers.

The bad news is that as far as I know there are NO proper drivers for Windows to support the microphone/headphone jack under BootCamp the only solution is to install Parallels on OSX and run the BootCamp partition under OSX which allows OSX to activate the audio jack and make it available to Windows.  See this posting on Microsoft which covers the issue
http://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/external-mic-not-recognised-by-windows-7-installed/b2ca0649-1d02-4245-af90-39ded898da5d
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cornell256Author Commented:
Thanks, this is great - I will study your post - not until next week, though. I did try Parallels and also its competitor but neither had performance that suited me as well as running windows natively. Too bad. Anyway, will read and reply in the near future. Thanks again. At least it looks like I don't have to try to figure this out - I just have to use the microphone (a real nuisance but since I only use Windows for Camtasia and testing an online application, not impossibly inconvenient).
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