my mic isn't working.

Hi guys, I just bought a Medusa Nx Speedlink headset and it seems that my mic isn't working i thought the problem was the mic, but i tested it on another comps and it worked.... I tryed all kind of settings that i found on the internet and couldn't help me ... i tried to plug the michrophone into the motherboard and still isn't working ..., it does nothing. I tried it on Ventrilo, Skype, Yahoo Messenger... . I have a Sound Blaster Live!24_bit Sound card. Plz help me out as soon as possible Thx in advice.

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