I finally got around to installing the PSU you recommended. I also added some GSkill ram to eliminate any possibility of faulty ram. I completely removed all the old Nvidia drivers and other programs.
Booted up expecting to have an awesome Saturday night with my upgraded rig and 8GB Radeon RX580. 7 hours later I have a very expensive paperweight. No video signal. No Bios access. Even the keyboard isn't getting any power. After several hours I decided to punt and put the old Nvidia card back in. No change. I took the new RAM out and put the old in. No change. I checked all the cables and connections a dozen times and yes the 8-pin power connector labeled "CPU" is connected. Nothing, no change n o matter what I do now. I haven't tried putting the old PSU back in that you suggested was faulty or failing (I used it for 3 months since my last post-it isn't faulty just not great). Also, it seems absurd to change out the PSU again since I have lights and power to all fans, just no post, no bios, no video signal. I am at a total loss as to what to try now just to get it back running with the old gear. I even tried removing the CMOS battery because I think that was how I got the RX580 to come up last time before it started crashing. Didn't do anything.
I cannot think of anything else to try and I am so ticked off right now and tired. There is no reason I can think of for this. I have been building my own PC's for 20 years and never ran into this before.
EDIT: Seeing how power is not reaching my USB connected keyboard (it is backlit so I can tell when it gets power) and not being able to get any signal on either card now or into Bios I assume my MB had died. Due to this bad experience I think I might sell the RX580 on Ebay. Any offers for this MB killer??