Well, let's see: The SB Audigy card would be recognized by Windows, but the driver installer packages kept reporting that there was no card to detect. And both that card's sound quality on played files like waves was horribly distorted. The AC-97 onboard sound was just as bad, and an Audigy 2 turned in equally bad sound. So there is definitely something wrong in the PCI bridge. There were major OS install troubles I tracked down to using SIIG PATA to SATA bridges, in an attempt to reuse older IDE drives. The actual motherboard started to 'lose' a SATA drive on bootup; a hard reset usually cleared that, but not always. This was on the SIL SATA RAID add on chip's channels. Finally, the boot drive on the main chipset started going 'away'. At the moment, I'm betting it's either a cold solder joint, one of the board layers didn't bond correctly and has separated just enough to be fatal, or I just lucked out and got a bad chipset.