Linux: Audio Sound Not Working

Desktop System, Full Tower
Motherboard: EVGA A8N LSI
Sound Card (integrated with Motherboard): Realtek ALC889
OS:  Ubuntu Linux 10.04

Experience Level
I'm an intermediate user on Linux: There are gaps in what I know how to do.

Background
I'm trying to get the audio working. (Mic too, but let's start with just audio for now.)
I have some instructions from another admin which worked in the past, but now they are not.

I had a SoundBlaster card installed in order to debug the mic issue and, although we never got the mic working, audio was working at that time. The SoundBlaster has been removed, and now there is only the Realtek integrated sound card on the motherboard.

I have a stereo headset w/ microphone plugged in to the Black and Pink ports on the back of the computer case.

Problem
I tried the following:

(1):
$ sudo alsamixer
   > Error: cannot open mixer: No such file or directory
$ which alsamixer
   > /usr/bin/alsamixer

(2):
$ aplay /usr/share/sounds/alsa/*
  > Playing WAVE 'Front_Center.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
  > etc.

However, no sound comes out of the headphones.
 
QUESTION
Can someone please guide me through the steps to get the audio working?
Jerry LAsked:
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Jerry LAuthor Commented:
SOLUTION
I discovered the solution.

The audio device was disabled in BIOS. So I re-enabled it.
The alsamixer now works and sound is coming through the speakers.

The mic is still not working, but I'll address that in another post.
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