Built in microphone?

[LedHead]

hey all i'm trying to get this guitar program to work on my new computer i made, but to me it seems like there is a built in microphone somewhere on the computer because when i tap on the case or at the back around the sound card i can hear the tapping through the speakers, and i was just wondering if theres a way to turn it off and just use the microphone input on the soundcard itself? your help is much appreciated as this seems to be the main problem in getting this program to work thanks for your help in advance

 

[Tmagic650]

You either have a loose connection somewhere in you newly built system or the Mic input on the sound card is turned way up... there is no built in Mic