I have an HP z556 Home Theater PC and I just recently upgraded it with a new motherboard. I have everything up and running in Win7 except for the Tuners on the PCI riser card. The original motherboard was a Asus PTGD-LR. It only had one PCI slot and one PCI-e x 16 slot. The motherboard I dropped in is an Intel DG33BU. It has two PCI slots, one PCI-e x 1 and one PCI-e x 16 slot. The riser card that came with the HP z556 plugs into a PCI slot and breaks out to 3 PCI slots without any ICs on it. My problem is that I can't get ANY PCI card to get recognized by the PC. I've tried uninstalling and reinstalling drivers. I've plugged in different, known working, PCI cards. I can't readily plug any cards into the PCI slot directly yet because the back of the specialized case gets in the way. Is it possible that HP specialized the original motherboard so the PCI slot could handle 3 cards or is that a standard that just isn't working on the Intel MB? I will probably pull the MB out of the case tomorrow so I can plug a PCI card directly into the MB without the riser card. Any other ideas? Sorry if I'm rambling, I've been thinking about this for days and can't figure it out... Thanks!