Is the drive powered by AC power?
Are you using a 6-pin to 6-pin cable with 6 to 4-pin adapter? Or are you using a 6-pin to 4-pin cable? If it’s the former, perhaps the adapter is the culprit.
If you have other Firewire devices laying around then you might be able to test them as well to make sure you don’t have a faulty port. You could also plug your TR directly into another system that has Firewire and see if the two systems see each other. They should automatically sense a connection.