Have you checked all the obvious things such as the cable, changing ports on the Mac, disconnecting other firewire peripherals etc? Also you can look in the Apple System Profiler under 'firewire' and see if it shows up there. If the port on the deck is completely dead you won't see anything listed in the Firewire node of the Apple System Profiler.
I don't think it's your FAM driver because even if this is out of date or not functioning correctly the deck should still go into PC Remote when it senses a live connection. Still, you may want to try reinstalling the latest FAM driver from http://www.sonycreativesoftware.com/famdriver , especially if you see the device in the System Profiler but cannot get it to mount. Note that the driver is not yet qualified for Yosemite (10.10).