Mac Book and Presonus Firepod could not link up

greetings:

I had quite a shock last night. I was set to record a performace of a students doctoral performance and I could not get my Firepod to synch up with my Macbook Pro. They had been working fine together.

Is this a common problem between Firepods and Macbook Pros, or could my firewire cable be defective.