Thanks for the reply.
I have checked the printer on my Windows computer, which uses it's USB connection rather than the parallel port used by the Hades, and it works fine.
I can't check the cable on another computer, but I have tried 2 cables I've got that connect the Hades to the printer, and it failed to print with either. It might be the ribbon cable that connects the motherboard to the "out" connector where the cable between printer and computer is connected, but I would need to source a known good one of those.
Somehow though, I get a feeling it is more a motherboard problem
All the best