Note that some newer PC motherboard chip-sets have issues with FW400 protocol.
I don't have firsthand experience with that so you'll have to do some research.
There are also some challenges with the newer and latest Mac OS and Thunderbolt configurations.
You'll have to search the forum for assistance on that topic.
If you are using Windows, a full step by step checklist for Windows 10 is documented as a sticky in the DM3200/4800 section.