Hey, Welcome to the forums.
hmm yea, IEEE stands for firewire, though it must be the connecting end of your one on the case that is wrong, and i'd have no idea i'm afraid to fix that
It should be one of those thin type of connectors used to connect the power leds, and so on to the motherboard that should be on the end of that connection...
I was going to say to buy a PCI firewire card to give you access to firewire, though this would connect to the back of the computer, and so wouldn't be able to use the one on the front... though this would be a fast way of getting it to work.
I hope this helps