I recently built my new comp

AsRock P55/Pro
Nvidia GT 240
450 CM PSU
Intel i5 2500
DDR 3, 4g ram

I'm currently running on Ubuntu 10.04. I can't seem to get audio. I'm using logitech x-530, which doesnt require any drivers (not that i know of). I've tried replugging/rebooting, but none of it worked. I've tried switching it to the in-built speakers in monitor, but still no sound. I'm pretty sure, P55 Motherboard has sound cards already, so i dont need to purchase a separate sound card. But could it be i didnt hook on the sound cable (if there is such a thing)? NEED HELP!