Microphone recognized, but doesn't work

[GoldenTWM]

I have a headset and the microphone was working well before, except I recently unplugged it temporarily, and when I put it back in, it doesn't work.

I can see that the computer recognizes that I have it plugged it but it doesn't pick up any sound when I speak.

Here you can see that it knows the microphone is in:
[URL=http://imageshack.us/photo/my-images/513/asgawsdwa.jpg/][IMG]http://img513.imageshack.us/img513/8702/asgawsdwa.jpg[/IMG][/URL]

Can you help me out?