My Conexant HD SmartAudio 221 sound card isn't working with Ubuntu 9.04 - how can I fix it?

Whenever trying to play any sound, my Ubuntu 9.04 computer just produces a crackling sound or beeps.

The PC has a Conexant HD SmartAudio 221 sound card, and sound worked fine immediately after I installed Ubuntu.  Though after a few reboots (and no changing of any sound settings) it decided to stop working.

The PC is dual-booted with Ubuntu 9.04 and Vista Home Premium.
pigletigerAsked:
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Fabio MarzoccaFreelancerCommented:
You can start troubleshooting from here:
https://help.ubuntu.com/community/SoundTroubleshooting
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pigletigerAuthor Commented:
I've uninstalled Ubuntu, so can't test to see if it works, but the website looks useful.
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