[ubuntu] No sound, except startup sound in 12.04

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http://ubuntuforums.org – Hello, I'm on a dell inspiron 1520 laptop, and all of a sudden the sound has stopped working. I tried repeatedly restarting, and the startup sound plays on the logon screen, but this is the only sound that will play. I'm sure this is not due to it being muted, or other sound settings. I tried the fixes found here, but no luck. http://sathyasays.com/2007/12/09/fix...-ubuntu-gutsy/ If anyone has any help, I'd be very appreciative. Thanks! (Hardware)