No Sound Output from Logic Pro 9

I recorded a 4-track performance in Logic Pro 9, but when I play it back the displays show that the sound is there but no sound comes out of my computer. Other files that I have recorded in Logic Pro 9 play fine. Any Suggestions?
My Preferences Core Audio is set to Built-in Output, with an I/O Buffer Size of 256, 24-Bit Recording, Unversal Track Mode and Software Monitoring. Audio Settings specify Automatic Management of Channel Strip Objects, Automatic Naming of Channel Strip Objects and Playback Pre-roll, with a sample rate of 44.100 kHz. My Apple Sounds System Preferences are set for Built-In/Internal Speakers, the output volume is all the way up, and the mute is off. I cannot figure out what is keeping the sound from coming out. Again, any ideas would be appreciated...

Here are some things to try.
You said you have core audio set to built in outout , yet you have an Apogee ensemble. Can you hear audio coming from the computer output?
Can you play other audio files from this session?
In the lower right hand corner of Logic in the arrange window there is a volume control, did you turn that down without realizing it?
Can you hear audio from another Logic Session?
Can you hear Audio From Itunes?

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