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Just some general guidelines - find your sound mixer - look at all the inputs outputs and switches - make sure the ones you need are enabled and turned up. Sometimes they wind up disabled or turned down in volume.
Since you're new to Linux, you're probably running GNOME. I can't be more specific, as I'm not familiar with GNOME - I use KDE.
do you have a package called gnome-audio installed? to see if you have, fire up the command line and type in 'which gnome-audio'. if its insalled, it'll tell you where its installed...but thats not important because you only need to find out if its installed or not.
if you haven't, isntall it.
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