Mono audio panning quirk

I'm having trouble with several mono audio clips(sound effects and a voice). I want them to sound like they're on the left or right of the on screen action so I pan them over. Only there's no sound if it's 100% left or right.
Let me be clear... some tracks die when max Left and one dies when max Right...
The audio is nothing special. Most of it is simple wav format stuff I found on the internet. One is a track I recorded.
My speakers work fine(I thought I was going deaf there for a while though) and I even tried my iPod head phones... to no avail. The audio still vanishes.
Here's where it gets strange. The audio even drops out when I export the sequence to a quicktime file. I read the stuff here about mixdown and did that... no luck... still dead.
What should I look for? What am I doing wrong? Is there some setting that's wrong in FCE HD? Or should I just give up and pan the clips more center and move on?
Thanks
1.8 GHz PowerPC G5 Mac OS X (10.4.7) Final Cut Express HD 3.5

Answer!
http://docs.info.apple.com/article.html?artnum=300832
Apparently some 3rd party app or multimedia content item automatically reset my audio output setting to a higher rate(better quality) which I'm betting FCE doesn't support. Also one of the sliders for setting the output levels was completely off(0) and even when adjusting the system volume would not move. A quick reset(just dragged the slider to its partner) and all those pesky tracks that wouldn't pan now pan.
Read the apple support doc above for a more complete (and more technical) description of what's wrong and how to fix it... if you run into the same thing.

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shouldn't the pan be on 0 by default? Pan equals balance?
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Mono audio panning quirk

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