I have lost all sound on macbook pro 10.6 and in ITunes can no longer play any cinema or tv shows purchased.  I believe it may have been caused by recent use of mini-display port   Toslink Audio to the TV.  What can be done?

I no longer have any sound on my macbookpro 10.6.8, not even beginning chime.
Furthermore, I find that I no longer have any images as well as no sound, from any
of my Itunes cinema, tv show purchases, etc.
I recently watched last week a couple of tv episodes through my TV
using a Mini Display Port + Toslink Audio purchased at Apple.
I use this device occasionally and haven't had any  problems til now.
Any suggestions to right the problem?.

In System Preferences>Sound do you have your internal speakers set as the output source?
You may have toggled on optical output with the Toslink cable - check to see if there's a red light coming from the port. If so, quickly plug and unplug a set of headphones for a number of times to see if you can toggle the switch back from optical to the internal speakers.
Good luck,
Clinton

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