Loud crack noise during playing

I'm getting an extremely loud noise like a Pop or Crack randomly during playing of a video from the timeline. It's not in the audio files and it never happens in the same place and it doesn't happen in the exported Quicktime file. Just during playback in Final Cut Express. If I unplug my Klipsch external speakers and play thru the iMac's built-in speakers, it sounds more like a loud one-time beep, then the audio disappears until I stop play and start play again and it plays fine again. Any ideas on what's causing this and how to eliminate it? It scares the crap out of me every time it happens!

It just happens when playing an edited timeline. The noise is not in the audio. It just make a random loud "crack" randomly when playing the video in the timeline whether everything is rendered or not.

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