E4500 not recognizing new PCI I/O board

I've just installed a new Sun PCI I/O board in my E4500 (Solaris 2.6). with
an X6541A card on the I/O board, but the system isn't recognizing it. All
the jumpers on the card are diabled; the J1 jumper on the I/O board is
disabled. If I'm understanding the documentation, that's how they should
be. probe-scsi-all doesn't show anything like /pci@, neither does
show-devs. I've removed and reseated the board twice. Again, if I'm
understanding the documentation about installation, I think I've done what's
necessary. Does the X6541A need a terminator on the unused SCSI port? Any
advice on what I should do next?

Thanks,
Harry Boswell