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$ su -After logging in, type:
# redhat-config-soundcard
this should cause systemt to auto-configure the device. It will also give the option to play a test sound that can verify a configuration.
If the auto-detection seemed to work, but you still didn't hear any sound, be sure your sound is not muted. From the command line, type
# gnome-volume-controlVerify that no output devices are muted or adjusted too low to be heard.