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I tried in "system-config-soundcard" but can't change default sound card order. Why linux is so hard to use? sigh...
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in general it is not
you decided to buy a $299/ YEAR operating system ( or the $49/year)
And a OLD VERSION at that . RHEL 6.2 is current and 5.8 is current in the older 5 series
RHEL is not free and designed mostly for the headless server
or in the office
it was never designed with general home use in mind
as such most things that most home users would want is NOT included
you would have to install them from the third party repos
see the red hat documentation for installing EPEL and ELrepo or RPMforge
https://access.redhat.com/knowledge/docs/
Also seeing as this IS RHEL and you MUST have a paid for license .Your very first stop should be with red hat tech support seeing as you ARE paying the $299 PER YEAR required support contract
I would start on the red hat knowledge base
https://access.redhat.com/knowledge/search
instructions should be in there
Then use the free forums when you have a specific question on doing something
RHEL 5.6 is old enough that it might not even support your hardware , if it is new .
if you are NOT paying red hat and not going to then do not use it
install one of the FREE rebuilds
CentOS 6.2
ScientificLinux 6.2
but be warned they too like RHEL were not designed for general home use .