No sound on my SuSE 9.1

Hi,

I have problems getting my sound system working.
YAST detects a SIS SI7012. When I test the sound board I get at looping 
sound that last for some seconds. If I test it again I get no sound at 
all. If I delete the sound board and add a new, yast detects the same 
sound board and I get the same result when testing the sound board 
(first test gives a very short looping sound for some seconds - repeated 
test give no sound).

The system is a fairly new clean install of SuSE 9.1.

Any suggestions would be much appreciated.

Regards
Bogi