No sound at all with kde

[Lorenzo La Spada]

Hi,

I installed kde some weeks ago, all is working fine now except the  
sound. I have no sound at all and yes Arts is installed (but maybe  
not well configured?).

When trying to activate the sound system in kcontrol>sound system, I  
have this message:

Error while initializing the sound driver
Couldn't connect to server
The sound server will continue, using the null output device

I'm not sure to understand what it means. I have no idea what I  
should do I didn't find any helpful hint in the kde home page.

Do someone know how to enable sound?
Please help me to configure kde to have sound.

My configuration:
-----------------------
mac ibook ppc g4
kde 3.5.3 installed with fink
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