Missing audio from half my video clips

Hi guys, i'm young & new here so sorry if i'm not very technical. Here goes:
At college we had to film interviews with a range of students. We filmed with a stadard digital camcorder on two days:
* On the first day we filmed with the internal microphone from the camcorder.
* On the second day we filmed with an external microphone.
Upon importing the clips into iMovie, the first day's filming clips are fine but the second day's filming clips are completely without sound! At first I thought it was a microphone issue, but upon watching the playback on the camcorder (and hearing that the audio was perfectly fine there) I realised that this was not the case. My second guess was that it was the computer's fault. But by recieving the same result on two different Macs, I realised this was not the case either.
So my latest guess is that it might be an issue with iMovie. Now, I've tried it on iMovieHD AND the most recent iMovie (with the new format) but the same happens on both versions.
Does anyone have any ideas what has happened/what I might be able to do?
Many many many thanks,
Barney

bhsleadership
I am in the process of preparing to test a sample from your brand and model camera in my Premiere Elements 8.0/8.0.1 on Windows 7 64 bit. I will have the results probably tomorrow morning.
For now I just want to put you through the drill that I do for anyone who says he/she is using Premiere Elements 8.0/8.0.1.
1. Are you working from the 8.0/8.0.1 Update of the program?
http://www.adobe.com/support/downloads/detail.jsp?ftpID=4653
2. Do you have the automatic Background Rendering and AutoAnalyzer features turned OFF.
For Background Rendering option. See Edit Menu/Preferences/General.
For AutoAnalyzer option. Click on Organizer in the row below the blue active Organize header in order to open the Elements Organizer. In the Elements Organizer workspace, go to Edit Menu/Preferences/AutoAnalyzer Options and disable all the AutoAnalzyer options. To return to the Premiere Elements workspace from the Elements Organizer workspace, in the Elements Organizer workspace, go to File Menu/Exit.
Is your computer optimized in spite of the fact that you have a high end laptop? I presumed so but always go to verify, no pile ups of preview files, conformed video and audio files et al.
Looking at the properties of your source media, I see:
video compression = MPEG1
audio compression = MPEG-Layer1 (.mp2)
Frame Size = 640 x 480 (4:3)
Pixel Aspect Ratio = 1.0
Frame Rate = 30 progressive frames per second
With properties like those you are sure to get a red line over that content since there is no project preset with that description.
But, your choice of the default NTSC DV Standard would have been mine also.
I am heading to try to get a quick look at the behavior of the sample video here in my Premiere Elements 8.0/8.0.1.
To be continued.
ATR

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