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