Most likely it’s a hardware problem, so unless you have another Firewire cable to try, you just need to be patient and wait for support to get back to you.
Sounds like basic troubleshooting there. But I know Firewire ports can have resettable fuses that only reset upon a full cold power-cycle, which might’ve done the trick.
The fuse will “trip” if there’s a surge on the port, as sometimes is the case if you try too hard to plug it in backward, or if there’s a static discharge.