Builtin Microphone does not work

Hi, i have lg p300 notebook and i recently installed ubuntu 8.10 I am new to linux but so far i'm finding it easy to use for the most part. When I try to use skype to talk to people my built-in microphone does not pick up my voice. I played around with the settings, and i cant seem to get it to work. When i turn up the volume on the front mic and run my finger over the microphone i can hear the noise in the speakers, but when i try to record a sound or my voice it doesn't work. Does anyone have any suggestions for me, please let me know.
Thanks.