Choosing a Mixer Microphone

[Rich De Steno]

I recently purchased a Behringer 1202FX mixer.  I plugged several 
different computer microphones into the XLR jack on channel one, but 
none of them work.  I hear nothing, but I do hear the line-in inputs.  
What type of microphone do I need for a mixer like this.  I am only 
interested in using it for speech, not music, and I don't want to spend 
more than I need to.  I found nothing in the manual that excludes any 
particular type of microphone, so I don't understand why these cheap 
computer microphones don't work.

--
Rich De Steno