if it was dead wouldn’t the ram not light up?
You're not serious with that, right? I mean, I would HOPE anybody attempting to fix or work on their own system would completely understand that on practically ANY electronic component you can 100% have parts of it that work and parts of it that do not, when something fails. There are multiple separate subsystems on any given motherboard. Multiple 12v systems. 3.3v systems. 5v systems. And ANY of them could work while all the others do not, or all of them could work, while one of them does not. Or all of them can work, but one of them has "problems". Or anything up to or in between any of those scenarios. It's not a light bulb where it either works or it doesn't. Motherboards are INCREDIBLY complex components with dozens and dozens of independent systems on them. There is never a guarantee of works or doesn't. That is what makes them difficult to diagnose much of the time.
What is the model of the "extra" CPU you have? What is IT'S history? Is it 100% known functional because you just had it in another functioning system or is it another "bought it used and have never seen it work" situation?
As to what you should do, you should answer the questions that people here have been asking, EXACTLY as asked, and then follow the recommendations that have or will be offered so that you can progress towards figuring out what the MOST LIKELY problem is. Sometimes there are just no guarantees without throwing parts at a problem but you can eliminate a lot of stuff before you get to that point by answering questions, listening and following directions. In the end, you have that option or the option to take it to a shop where they know how to diagnose hardware. That's pretty much your options as to what you can do.
Also, aside from the "Smart series" power supply, what is the "other"model you tried? And how old is that unit? Was it "used" as well? EXACTLY which parts in the WHOLE build are "used" and exactly which parts are new?
If the "evga nova 650" is the other PSU you are talking about, what is the ACTUAL model of that unit, because that is NOT a model. That is a very limited description of a series of power supplies that stretches back ten years or so, includes dozens of models and series and happens to also include some very good and some incredibly horrific power supply models, so saying "EVGA", "Supernova" or "650w" literally means about as much as saying "food" when somebody asks what's for dinner.