Windows 10: PC goes into bare cyan pre-Welcome screen after a time

I have several Windows 10 1803 or 1809 version PCs which have Standby set to 'Never'. After a period of time, say 15 minutes or so, the working desktop display becomes a pre-Welcome screen bare cyan display which will not respond to mouse, keyboard or CTRL+ALT+DEL. A re-boot is needed which starts normally with the login screen. Any solutions?

:)

 

PC Build Steps

Ok just because I like steps i am going to create some steps. Please give me the stamp of approval/disapproval

• Install system in case
  • Remember to connect SSD and optical to same SATA ports on motherboard
• Turn on PC
• setup HDD
• run blend test in prime95 for 30-60 min
  • run realtemp at the same time

• While in Prime95 test
  • if CPU goes above 70c in RealTemp, I have a leaky CPU
  • if my system locks up or blue screens, there is an instability in the system somewhere
  • if my system does not lock up or blue screen, my CPU is not damaged and I am in the clear!

What do you guys think??

 

PC Build Steps

1.1 - Ideally put optical in SATA 0, and SSD in SATA 1, this will cause the optical drive to be the default 1st boot option. You can change it manually if not, but I like it this way
2.infinity - yes, that's fine. if it's above 70 +/- 5 degrees, then it may just need a repaste/remount

 

Cyan & Teal AeroHybrid


Thanks Keith. I just need to decide some minor, barely noticeable things now, like window frame color(a soft teal or a more highlighted cyan. The frame is just as veeeeery thin line, so...)