Not sure what verison of Windows you've got, but it should be under control panel, Sound and Audio Devices, and the Audio tab.
Are the Crystal and C-Media CMI8738 the same thing do you think? Or is the Crystal the onboard sound (because we know the CMI8738 is the PCI card).
Since it stopped working when you disabled it in BIOS, maybe the working sound was actually coming from the motherboard rather than the PCI card?
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