Thanks Alan,
I'm going to try my setup again to pin down when exactly the SOUND preferences 
window refuses to reveal Internal speakers. It occurs afterI have been playing 
though Apple Tv but not immediately. I think it could be after the Apple Tv is 
left on for a day or two and meanwhile I have had reason to restart the iMac, 
but I'll wait until I ned to do that to let you know.
All my software is up to date.
cheers


Marcus
Marcus Harris
P.O. Box 7135
Marcus Harris
Shenton Park
Western Australia 6008
Australia
Cryptodome Pty Ltd
cryptodo...@me.com
Mob: +61 (0) 417965618





On 17/09/2013, at 10:09 AM, Alan Smith <sma...@iinet.net.au> wrote:

> Hello Marcus
> 
> I have no problems with the various options of playing music around my home 
> network.  I can't replicate your problem.
> 
> How are you attempting to switch music from AppleTV back to the iMac?  Is 
> this a new problem since, say, OSX 10.8.5 update?  Are you referring to 
> "Apple Preferences - Sound", the "Apple TV Settings", or the iTunes icon to 
> "choose which speakers to use"?   Do you initially choose the music from 
> AppleTV/television or from iTunes?
> 
> If you switch via the iTunes icon, then are your various devices visible 
> initially?    I have choice of Computer, AppleTV or Airport Express.  Do you 
> have Single or Multiple option selected?  What displays when the problem 
> happens?
> 
> I find the Apple Preferences - Sound to be unstable on rare occasions.   When 
> this happens the ticked item does not work.  I generally get it working again 
> by ticking another item and back to the output (or input) I want.  But all 
> choices are still displayed.
> 
> Cheers
> Alan.
> 
> 
> On 16/09/2013, at 5:08 PM, Marcus F Harris <cryptodo...@me.com> wrote:
> 
>> Hi, I tried to switch playing music in iTunes from Apple TV back to my iMac 
>> desktop.
>> The sound preferences window, didn't show the iMac as a choice .
>> I turned off the Apple TV and that didn't change anything.
>> I then restarted the iMac and low and behold sound was available as a choice 
>> on the iMac.
>> Is there some way to avoid this process of switching from Apple TV back to 
>> iMac? Hopefully I didn't miss something obvious!
>> iTunes 11.0.5
>> iMac 27 late 2009 3.06GHz System OSX 10.8.5
>> Thanks
>> Marcus
>> Marcus Harris
>> P.O. Box 7135
>> Marcus Harris
>> Shenton Park
>> Western Australia 6008
>> Australia
>> Cryptodome Pty Ltd
>> cryptodo...@me.com
>> Mob: +61 (0) 417965618
>> 
>> iMac 27 late 2009 3.06GHz System OSX 10.8.5
>> 
>> 
>> 
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