Chosen Solution
Hi! I purchased a refurb mac pro 2012 on which I have a few upgrades(Gtx 1060 6gb, 240gb SSD) All was working swimmingly for about the first month but recently I have had some worrying issues. At seemingly random points the mac pro with no warning will shutdown or restart. I have not really been able to pin down on which specific kinds of processes it shutdown/restarts on. I thought certain processes were causing it(GPU) but that hypothesis has not been reproduceable. What I have tried:
- Reset SMC -Remove HDDs reseat, remove GPU reseat
- Remove all RAM and replace
Your symptoms indicate a failing power supply. The ones I have seen the shutdowns start happening every once in a while and get progressively more frequent.