Why no sound output?

This will seem really dumb but I am getting no sound today, on the same project as yesterday. I am playing an Akai EWI breath controller and can see in the transport bar the 'NO IN' change each time I play a note. But the bottom 'NO OUT' stays that way.The Edirol UA-25audio/MIDI interface is working-I can play iTunes and the output is routed into the Edirol and then sent to headphones or Monitors and have sound.
Would having no prelisten channel strip cause all output to stop?
I have also lost the mini faders in the track headers even though they are supposed to be there using configure track headers-where could they have gone? I have version 9.1.1

Thanks Ericsimon for the reply. The mini faders had changed form and position-I had forgotten that,my bad. No, they haven't! in some projects I just checked there is a fader at the far left side of the track header, not related to the automation level I can see the audio played by the track's assigned instrument but both NO IN and NO OUT remain . I also searched for the NO OUT display area and that box in the transport is for MIDI data, you reset something MIDI by ctrl clicking on the NO IN or the NO OUT, if you can discover anything about this I would love to hear about it.
The NO OUT used to show the audio output [ it still does when working properly ] fromt he VSTi being played and did that until today. I ran Disk Warrior and that may have changed the settings. I believe it has to do with the audio/MIDI setup not saving the settings and if I put the pref for audio/MIDI setup on the desktop the OS should create a new one. I had this before and the old plist was corrupted but making a new one worked to restore the save in audio/MIDI setup

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Hello,
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I Finally figured it out...
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Why no sound output?

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