No Audio on some HD clips?

I imported a bunch of HVCPROHD rez clips @ 23.98 into a bin in Final Cut HD 4.5. All the clips have audio but only some of them play audio in final cut. They all show up as V1 A1 in the bin directory. I went back to the original quictime files and all the audio plays fine there. Any ideas why some clips would play audio and other won't?

Thanks again for the reply. Sorry for bumping the threads up. Working on a timeline and debugging a new system is frustrating to say the least...
To answer your notes, I have tried everything I can think of to resolve the problem. I am now lip synching with no audio to keep working.
-Were the problem files all from the same tape or different ones?
ALL FROM THE SAME TAPES.
-Have you tried re-exporting the problem files from the original files?
NO, ORIGINALS ARE 3 HOURS SOUTH OF HERE.
-Have you tried creating a new project and/or sequence and reimporting the files into FCP. YES. NEW PROGRAM, NEW BIN, NEW SEQUENCE, NO LUCK.
-Have you tried taking the material off line?
YES. DID A RELINK MEDIA TO NO AVAIL.
-When you say no audio, do the meters move but you don't hear it or the meters don't move?
METERS DO NOT MOVE AT ALL.
-Have you used FCP Rescue to trash FCP preferences?
NO, HOW DO I DO THAT?
-Have you tried the files on another computer running FCP?
I HAVE TRIED THE QUICKTIMES ON ANOTHER MACHINE AND THEY WORK FINE. DON'T HAVE ANOTHER FC SYSTEM TO TEST THE IMPORT PROBLEM WITH.
-Was the system that captured and exported the files running a different version of FCP than the one you are currently running?
NOT SURE BUT I WILL ASK THAT TOMORROW.
Here's the weird part. All the media was captured the same way from the same source. All of it works perfect if I open them individually in Quicktime. Once imported into FCPro, only certain clips play the audio. All clips show V1, A1. and a 48k sample rate in the bin info. I can't understand why some clips play audio and others do not. I even looked at the file sizes and there is no pattern as there are larger files that play and smaller ones that don't and vis versa. Thoughts?
J

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