IO Cards Problem setting up Display Card on Master Card

[Barrykensett]

I am having a problem setting up new Master Card and Display card. I have input switches on the master card and when I run Controlador I can see all of the switches as I select them - all seems normal. When I connect the Display card to the Master Card with all of the input swtches off, the switch numbers all appear in the input box. This happens whether or not I have the display segments connected to the Display Card. I cannot control the segment displays with Controlador.
On another part of the sim I have a Master Card and two display cards running perfectly, I am not new to these cards. I have changed my old Master Card and a Display card with the new ones and no difference so I think the cards are OK. I have copied the existing Controlador.ini file so I know that works.
I'm stuck with this, anyone any ideas?
Barry

[Barrykensett]

Ah found it after much searching, faulty ribbon cable connecting Master Card to Display Card.
Barry