Just put a new system together with an Asus X570-E, Ryzen7 5800X, Enermax Aquafusion AIO cooler, 64GB Patriot RAM, Corsair 1000w PSU, 1tb Samsung M.2 and EVGA 1080ti in a new Corsair case. The 1080ti came out of my old Intel X99 system. Everything went together fine, booted and installed windows on the first try. Updated bios, loaded drivers, MS Office and a few apps then was about to start getting all my apps loaded. There were many shut-downs and reboots during this time. I went to turn on the system and nothing happened other than the some lights on the motherboard staying on. Suspected the PSU so swapped that out and no change. Did all the usual stuff - pulled the ram except for one stick, re-seated the CPU, etc., but still have the exact same behavior. No beeps or codes. RMA'd the MB and it tested OK. All I know that they did was re-flash the bios. Put everything back together and it started right up - right where I left it. Installed a bunch of SW and then figured I should shut down and start up to test it. Same damn thing happened! Thought it might be the power switch on the case, so pulled the cable and shorted the pins - exact same thing. Any ideas? Since I am switching from Intel to AMD, I don't have a spare CPU to cross-check, but it doesn't make sense that it would start, run, but just not restart. I am so frustrated...! To clarify, it never makes it to POST. There is obviously power getting through since all fans start to turn, the light show starts, and then it shuts down immediately.