Random muting of Mac sound. Why doesn't Mac adress this?

I am having a recurring problem with the sound randomly muting. In the System Preferences panel, the volume slider is grayed out and the 'mute' option is checked but also greyed out. This has been happening on and off for a while. Sometimes restarting works but not always. In googling this problem it is obvious that this has been happening to many people since at least 2008. What is going on here and why doesn't Mac fix this problem? It is a huge waste of time when working on a project to have to screw around with this.
Has anyone found a real fix other than just trying to reboot?
I am using a 27" iMac, 2.93 ghz/core i7, Mac OSX 10.7.4.

As you were told earlier when using your other id, the right forum for questions about .Mac mail using a web browser is here:
http://discussions.apple.com/forum.jspa?forumID=961
Try posting there, providing info on the browser you are using in the subject line.

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