ISSUE SOLVED I had an automation line inactive (I forgot I had a line there) my bad, sorry
Here is the case history so you may bask in my stupidity XD:
After 5th tier research, doing catalytics, the dupes stop delivering water to the super computer. I have plenty water available and it is in not too hot, oxygen filled area. Both water source and the machine. Also dupe stress is at 51%
They do research on the smaller machine, but not on the super computer. I have gofers, couriers and ground keepers to do supply and research. And naturally my tenured scientists.
EDIT 4th February see last two pics. I built a new super computer to a location next to the water source and it seems to work now. Earlier rebuilding in the same location did not help. Not sure if the warmth was the issue? My tenured scientists were wearing warm suits, apparently they are too posh to science XD
I was an idiot and forgot I had made an automation link to the SC, like always also this time the issue was between the game and the chair sorry