Communication error with Epson 2400

I am trying to use my Epson 2400 printer with my MacBook and my MacPro, both using Leopard (10.5.5) and connecting by FireWire. When I try to print a photo from PS CS2 with the MacPro, I get a dialog box in the printer application stating that there's a communication error, and the job doesn't print. When I restart the printer and the computer, the same job will start to print, but halt partway through, again with a "communication error". If I then try to print again without restarting, the job won't even start to print. I have to restart the computer, with the same results all over again.

Printing works fine from the laptop using PS Elements. I don't have Elements on the MacPro or CS2 on the laptop. I also have not tried connecting the MacPro by USB, but I shouldn't have to do this.

Any guidance?

Thanks,

--howard