FC7 hangs on SB16

[raagu _]

Hi,
  I have Biostar M7VKQ mother board with built in sound card AC'97 2.2 Audio
CODEC. There is also an external sound card Sound Blaster 16 which I have
attatched. The problem is that the onboard sound card is working fine. It is
when I make the SB16 sound card work by making it default that the audio
plays for some time and the FC7 hangs. I then have no option but to do a
hard reboot

  I tried reinstalling the latest version of ALSA drivers/ utils/ lib
packages but have had no luck.
  Would apperciate any solutions given

-- 
Thanks,
Regards,
Ragavendra.
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