I'm relatively new to Ubuntu and installed it yesterday. I can hear sound out of my built in speakers on my laptop, but when I plug in my headphones I don't hear anything. Occasionally when I go do something that requires a sound I hear a faint white noise in my headphones. I tried going to alsa mixer and muting and unmuting everything, but that didn't work, though when I got to the headphones I muted and unmuted each side, and each side gave me a faint white noise for a second when I did it. The headphones work fine when I'm running Windows 7.

I'm using a Realtek ALC663 Nvidia ID5

Thanks so much for your help!!