text: what would cause a sound blaster audigy card to screech when installed on a biostar m7ncg 400 motherboard? i have a biostar m&ncg 400 motherboard and on it i have a sound blaster audigy sound card (pci).  the sound card screeches fiercely during some games.  it does not screech when playing system sounds.  i thought it was a wire from the fan resting on the sound card and emitting static but that is not it.  any ideas?  