No sound output in Messages

I'm running 10.8.2 on a MBP 2.66 ghz Intel Core 2 Duo.
When I go into the Messages preferences, the Sound output option is greyed out, similar to the Camera.
Microphone is working fine but I can't hear anything from the other side.
If I plug in some headphones, Sound output option changes to Headphones but remains greyed out and sound still doesn't work.
I've already tried resetting the PRAM with the Option-P-R trick but that hasn't helped.
Thanks in advance for helping to fix this.

HI,
Sound in Messages needs the Output device set in System Preference > Sound > Output in the first place.
This should then show up in the Messages Menu > Preference > Video Section in the output drop down (If there is only one choice in System Preferences then it will not be a drop down but just the greyed out name of the Output.
PRAM is OPT+CMD+P+R not just Option and the letters.
If you have sound in other apps like iTunes and the volume is actually set high enough then open the Connection Doctor in Messages > Video menu.
If you do this during a Chat then the incoming Video and Audio feeds are represented by two green bars.
Having a green bar fro audio doe snot actually mean anything is being sent from the other end.
But a lack of a green bar does mean they are not sending anything.
Get them to Check:-
They has set the mic and Volume in System Preferences > Sound > Input.
The volume needs to move the blue response bar at least halfway but not bang into the right hand end.
The Same mic or input device needs to be selected in Messages > Preferences> Video Section > Microphone Drop down.
It also needs to be "On" and ticked in Messages > Video menu > "Audio chat Enabled".
(IF they are using iChat then same Menu > "Microphone Enabled")
You can test to a certain point with several computers that Apple tend to keep on line as text accounts (they Auto answer with no human interaction)
Add appleu3test01 or appleu3test02 or appleu3test03 as Buddies to your AIM list.
Normally at least two are on line but as I type this is seems none of them are.
They tend to be playing Apple Adverts and the like.
8:53 PM Monday; January 28, 2013
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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http://img408.imageshack.us/img408/3544/picture1xnn.png
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Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points
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How can I put all output error message into a String Variable ??

Dear Sir:
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import java.awt.Frame;
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Well, i've been digging all the forums lately in web. my problem is, i can't change my 'system' sound output to my sound card which is Native Instruments Audio8 Dj.
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If none of the 5 R's helped address the issue, it's likely hardware related.
http://www.apple.com/support/ipod/five_rs/
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