Boy!! Where to start? Just put together what I thought would be my main PC...from a mix of components, most bought this forum from multiple sources...an X570 mobo, Ryzen 9 3900X, 64 GB ram and an RTX 2080 Super which I just got elsewhere but was thinking of keeping instead of my trusty old GTX 1080Ti Xtreme. Brand new Windows Pro install, did the updates and was undertaking getting my programs set up and bench-marking done. I routinely run a full set of various benchmarks [AIDA x64 Speed Queen, Aida Memory Cache, Cinebench R15, Superposition, Heaven, Valley, 3DMARK Sky Diver, Fire Strike and Time Spy] as well as Thaiphoon Burner.... Crikey! I cannot even get the first 2 things done...no sooner [it seems] than I click start on the Aida Memory cache test...within seconds the system just shutdown! Bang! Turns off and then after a short while goes through the BIOS/Boot stage, sometimes ending up at Recovery options...other times going back to desktop...coupla times it got to desktop and just switched off again. Had my doubts I could even get this written and posted...still hoping. I have changed the ram, Video card checked the CPU cooler was seated properly and good TIM...everything IO can think of...temps were warm....but not enough to cause a shutdown [was 64°C even at 4.00 am running a 360 AIO...] Will see what pointers I get here but inclined to rip it all out...see about sending the parts back to the individuals and getting a refund...caused am pretty peed right now! At one stage after maybe 5 shutdowns...I actually used my phone and made a video and pretty soon after the Aida Memory Cache benchmark started...SHUTDOWN! I think that points t a memory issue...but there was no record in the Nirsoft Bluescreen Viewer software that someone this forum recommended a few weeks ago for a different issue... Gotta get this uploaded before it all gets lost!