Is analog audio and optical audio on the same path

My audio out- mini jacks have stopped working, front and back.
NO audio comes out of either of them.
Audio does come out of the small internal speaker.
I am an editor and NEED sound.
SO if audio is gone on the mini jacks, does that mean the audio will be gone on the optical side?
System preferences don't have any settings to change for optical out (snow leopard)
Anyone think it could be software and reinstall of operating system might help?
already did PRAM reset and the unplug for 15 seconds(SMC) thing, NO effect.
This just happened one day to the next.

One experiment -- In your /Library/Prefererences (global Library, not the one in your home directory) is a folder called Audio.  Within there are two plists:
com.apple.audio.SystemSettings.plist
com.apple.audio.DeviceSettings.plist
Temporarily remove these, i.e., drag them on to your desktop.  Then reboot and  set you Sound system preferences.  I am not sure this is going to work and I believe these two plists will be recreated in the Audio folder.  If not, put the two original plists back into the Audio folder that you moved to your desktop.

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