cerebellum: Before you try to "fix" the FC2 sound problem, run the volume control application and turn up all settings to Max. If you are trying to listen to a CD as a sound test, many of us have found that you need to set the CD slider almost at Max to get the CD sound to work properly. There really is something odd about the sound configuration in FC2.
I suppose sound problems may be for FC2, what getting SATA drives to work were for FC1. After all, FC is just the Guinea Pig for RHEL.