Shotgun Microphone Connection

[Gorn]

I'm having trouble getting audio from a shotgun microphone I have connected into one of the XLR inputs. How can I get the microphone to work?
As a precaution, I did put in new batteries into the microphone.

 

[Mike Harvey]

1) Which input is it plugged into?

2) Is a channel set to that input (channel 1 can choose internal/1/2, channel 2 can choose internal/2)?

3) Is the input set to "Line" or "Mic"?

 

[Altared Weddings]

Also, many external microphones require phantom power, 48v, which you can swith on, just next to the audio input switches.