FW drive won't mount when 002R is on

Hello-

I've had an 002R for years, and have used it with OWC FW drives, connected properly, iMac-FW drive- 002R.



Recently, I can't get the drive to mount when the 002 is connected and turned on.



Without the 002, the drive mounts normally.



When things aren't working, in System Report on the iMac, I get a message that reads "Unable to list firewire devices".



Thanks-



PC