I bought a dynamic mic to use with my computer yesterday but when i plug it in and sing with it, i can't hear any playback of my voice coming out of the speakers. I've tested the hardware in the audio propeties and the mic works fine and gives playback on there, but when i am just using the mic out of the hardware test, i don't seem to get any playback from the mic.

I basically want to hear my voice as i sing... just like a karaoke machine. Any suggestions?