I have 2 separate USB PCI Cards that I've tried to install into my Power Macintosh 8600. Neither one of them gets seen in the system profiler. The first card was a generic chinese pci card from ebay. But the second one was a card that was advertised to work with Mac OS 9. Neither worked for me.
I tried a few things to make them work, including: pressing the cuda reset switch for 30 seconds, switching pci slots, reinstalling Mac os 9 on a spare partition. Nothing has worked yet.
I have a Radeon 7000 PCI plugged into the slot closest to the processor's slot, and it works fine.
Any ideas?