Mac Pro early 2009 FireWire problems
You can lookup connected FireWire devices in the Apple system profiler under Hardware > FireWire

Open the System Information or System Profiler app from the Utilities folder of your Applications folder. Or just hold down the Option key while choosing System Information or System Profiler from the Apple menu.

Most FireWire devices will show up out of the box. FireWire audio devices usually require additional third party driver software.