"An unexpected error occurred #19 AudioWire driver.cpp 1626 (-1000)".
I did the usual trouble-shooting, replaced drivers and so on. I decided to look inside the Mac with no coherent plan. I opened the side door lay it flat, wiggled the firewire cable=AudioWire and went back to the computer and fired up Logic. Lo and behold it worked! Joy!
Shaking my head I CLOSED the side panel of the Mac and the error etc is all as before. Opening and closing the Mac again doesn't help. Back to square one

It looks very much as if the aperture-the opening-the socket bit where the cable plugs in is the likely culprit. I tested the "AudioWire" cable and it's fine. So, if it is that connection in the card...what should I do?
All and any help deeply appreciated.