By default Mandriva comes with Pulseaudio like all major distros. In Mandriva 2010 Pulseaudio actually works quite well (in most cases) so you don't need to disable/remove it like most people do in Ubuntu (and in older Mandriva releases).
You need to configure the default sound device in the "Pulse Audio Volume Control" app that's located in the Sound&Video program menu.
Also if you installed the KDE version of Mandriva, then you need to configure the KDE sound output in the "Configure your Desktop" app (General > Computer Administration > Multimedia) that's located on the bottom toolbar.
I don't know if the Gnome version has a similar setting, since I don't use Gnome.
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