I can go caseless on a shelf/tray in a rack.  We have ~ 15 racks, not too much free space, but enough to get by.  Currently, I just tried plugging in a 5850 using those silly molex 4 to pci-6 pin connectors that ship with the units... the video card gets power, the fan is spinning... but it doesn't show up in windows.

Not sure why, I tried multiple cards with multiple little adapter cables.  I was hoping to use some of these smaller 650W psu's i have laying.

damnit... ideas?