I have that Sonnet Tempo ATA133 I had acquired for testing things related to the G4 Xserve.
So it works in my working MDD and my DA, but the thing will not work in the B&W.
Try as I may, if it is installed it will not do anything beyond chime. Take it out and it boots fine.
Try all the PCI slots, with and with out drives plugged into it, with and without a drive on the built in ATA controller and every combination known to man.
I'm not ruling out some issue with the B&W, but is it common for those machines to be picky about cards that are installed?