Thanks for the quick replies Robm and DSB.
I'm so relieved that you both think a fuse or fuses are the problem and I should have thought to look at these myself first. I really appreciate the extra info and supplier link. I had honestly face palmed when this happened - something tech always goes wrong for me at the time of year when it's hardest to get parts or help!
I was real concerned that the re-seating of ribbon connectors is resolving the issue with the DMD. I will look to replace the cable connected to the DMD first and see how I go. Is this common?
I'll report back first opportunity I get in early Jan. Thanks again fellas and have a great new year.