Download this file and save it as alsa.questions
wget -O alsa.question http://nopaste.com/p/alsa.questions
Answer the questions by editing alsa.questions in the directory you downloaded it into.
Answer these alsa troubleshooting questions, please.

Is your PC a laptop or Notebook PC?
Answer yes or no, answer no if your PC is a Desktop PC.
Enter your answer here:

Is a Surround Sound Speaker System plugged into your sound card?
Answer yes or no, answer no if you do not know what a surround sound speaker system is.
Enter your answer here:

Have you tried any model options when loading starting alsa?
Answer yes or no, answer no if you do not know what model options are.
Enter your answer here: 

Enter your make and model number for your laptop, desktop or motherboard? [example: aces p9m99-m9].                                  
Enter your answer here:

What is the total number of jacks that can be plugged into your soundcard? [examples: 0,1,2,3,5,6]
This jpg photo explains what a jack is: http://home.cfl.rr.com/infofiles/soundcard2.jpg
Enter your answer here:

Number of speakers connected to the sound card? [examples: 0,1,2,6,8,10]
Enter your answer here:

Are your sound card's speakers powered by a digital receiver?
Answer yes or no, answer no if you do not know what a digital receiver is.                                  
Enter your answer here:

Describe your sound problem:
Enter you sound problem here:


Then upload the edited alsa.questions file with this command:
curl -F file=@~/$USER/alsa.questions nopaste.com/a
curl prints a URL when it uploads the file, post the URL in #alsa