windows 10 x64 currently updated, system disk samsung 970 evo healthy ssd, mobo msi x470 gaming pro, 16 gigs ddr4 ram, randomly hangs on post after restart with black screen, no way to solve excepted by hard reboot, chk dsk ran: no problem found, thinking of mbr corruption ? thanks for your help
Have u tried using the dism command to check the health of the OS open the command prompt in elevated mode and type that. DISM /Online /Cleanup-Image /CheckHealth
If you do not find any errors and you are sure that everything is fine, but the error still occurs, check if the OpenSSH Authentication Agent is set to autostart, if so, set it to manual start or disable it at all. I can't guess if this could be the cause of your case, but in many cases it has been the cause of a similar situation.
This error is related to an application which force restarting the system. Now you must find which one.