WeztmarchOkay sorry about the cursing and confusion. Windows 1903MSI MEG Z390 latest BIOS is revision 5 I thinkFull specs are in my signature.
aka_STEVE_bI have read more than a few threads on other forums finally nailing it down to Seasonic PSU's having some sort of weird issue with certain 20X series Nvidia cards... No matter how new the PSU is... I would get a different brand PSU & give that a try. Use a store that offers a liberal return policy , if it ends up not being the problem.
Cool GTXWhich Nvidia driver ? Have you ever used DDU - to cleanup your old driver scraps in Windows ?