FCP Random Sound Loss - Please Please Help Me

Please can anyone help me. I have just taken two days off work to do a friends wedding video my whole first day has been trying to work out what is going on with the sound. I have gone through all the forum pages and nothing is the same as the problem I have.
I use FCP 4. I have a movie exported movies from imovie as .dv file into FCP. When I double click it in the FCP browser I have full audio in the viewer when played. I import it into the time line no problems so far. The red bar is on the top and when I pay it I hear the beeping whichh means I need to render it. So I do the apple and r to render it. Then it is in the time line.
The problem occurs when I play the file that has just been rendered in the time line. It plays audio for up to half of the clip and then the audio is just not there. I will have done exactly the same with previous clips in the time line and they are ok. The audio will just disappear mid clip. It will be fine half way through the clip and then the audio will will just not be there.
It never seems to happen in the first 10 - 15 mins of imported video clips but after that it can just drop at any time. sometimes I have added clips after this point and they have been ok to a point and then they will drop sound mid clip as well.
If anyone can be of any help I would greatly appreciate it. I was one of the ushers at the wedding and my present to the happy couple was the movie of their wedding. So I am really up against it which is why I took a couple of days off to finish the job. But I have got no where today.
Do you think that it could be anything to do with the speed of my computer?
I tried FCP Rescue but this didn't make any difference.
Please please help me. I would be in your debt if you can help me out.
Thanks
Jon

Jon:
Your configuration is a little low on RAM, but the processor(s) are certainly fast enough to handle this file. You should match your sequence to the audio sample rate from your original clip. Single click on your original clip in the FCP browser. Then "Command" (Apple Key) + "9". This will bring up a window with details about the clip. Look for the "Aud Rate" and "Aud Format" information. Your audio rate should be 48kHz or 44.1 kHz. Doesn't really matter what it is, just make a note of it. Close that info window. Now activate your sequence window by clicking on it once. Up in the FCP menu choose "Sequence" and then "Settings". Look for Audio "Rate" and "Depth"--they are in a separate boxed area at the bottom right. If possible, select the audio settings that match your clip. If you can, this will eliminate the need for rendering your audio. If not, rendering is your only option.
Check some of these clips with missing audio in your preview window. (Double click on the clip or Control-Click and select "Open".) Play the clip. If the audio is there, it's definitely an issue with the timeline. If not, the problem is with the clip. Try turning on the audio waveforms in the timeline. (Make sure your timeline clip icons are big enough. Select "Sequence" and "Settings" then the "Timeline Options" tab. Select Medium or Large for the Track Size, then click on "Show Audio Waveforms". Or "Option" + Command" + "W" on the keyboard.) If the audio waveforms are in the timeline, you have audio but your system is not able to keep up. Oh, and when I say "timeline" I mean "Sequence".
If you have determined that it is your system and not the clip or the sequence, then finish editing the project if you can. When you are done export a "Final Cut Movie"--make sure it is "Self Contained". Play that movie in QuickTime Player to be sure your audio is fine.

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