> A while back I bought an external sound card. I'm very happy with it by 
> the way. But then I unplugged my microphone from my PC's built-in sound 
> card and plugged it into the external one. I can't hear a damned thing.

As Marc said, your microphone is probably a powered one, and PC sound cards 
normally provide power on the mic socket.

> "OK, so it needs a line input" I thought. So I went out and bought a 
> microphone preamp. And you know what?
>
> I still can't hear anything.

The pre-amp is probably expecting a real microphone, not one that needs 
power.

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