I will defer to your expertise Mike cause you have the experience ofcourse. I am good with most basics but no where near as switched on with this stuff like u are.

I thought he had 2 x seperate issues, one being restarts, and one being the DMD....the cable reseating usually fixes the dmd, unless the dmd is on the way out, and the 5 volt reg fixes the restarts, for us laymans who arent as cluey with all this stuff....I am lucky I have Beaky nearby, cause alot of this stuff does your head in its so dam complicated.  I am hoping Wotto has it sorted and its back to normal. Nothing more annoying when a machine plays up, but due to their ages, its expected i guess.