Knoppix locks up on playing sound

Hello all,
I have really enjoyed this forum and knoppix 3.3... I'm a noobe, but have managed to do a HD install on a SONY Vaio PCG-GRT100 laptop. I was able to get everything working including the USB floppy and Gforce4 420 Go Sony video card.

The only problem I have now is I have to use the NOSOUND cheat code because any sound being played will cause knoppix to lockup...

I have a SigmaTel Major-C onboard sound card. Autoconfiguration see the card and uses the Intel 810 AC97 alsa drivers

Any suggestions would be grateful!!!