Fyi, I had one major issue on my Power Mac 7500 (a small step down from your 7600). For some strange reason, the PCI port on the far left (farthest away from the CPU card slot) had to be soldered recently. Apparently, the slot wasn't soldered on solidly and it caused the Mac to not recognize the PCI card plugged into that slot. So, you may want to double check thoroughly that it is secure. Other than that, maybe your fire-wire card is fried? A possibility, but hard to say.

Well, if System Profiler recognizes the card on the beige G3, that means you may have to install the Keyspan's system extension file(s) into the Extension Folder and restart. The same way also apply to the 7600 as well.

73s de Phreakout. :rambo: