Microphone not working

To locate the source of your problem (with the information available):

Try your mic on a different recording device. Something simple like a tape recorder.

• If it works, the problem lies in the your recording system.
  
• If it doesn't, The mic is the problem.

Or:

Try a known working mic on your system.

• If it works, the mic is the problem.
• If it doesn't, the problem lies in the your recording system.

Thats about all I can give you with the info provided.
If these tests point to the mic, replace it. If they point to your recording device/system/whatever, more details will be necessary to effectively troubleshoot your problem.

Hope this helps,

Mike