Computer Crashes and Screen Goes Black

I had this problem once and it turned out to be the video card. If it has onboard video you could remove the video card and try the onboard to see if that works. If you don't have onboard video maybe you could borrow a video card from a friend to see if that would work. Not saying that is your problem but I did have the exact same thing happen but I had a Radeon video card.

 

Hello and welcome Liam, That's a tough situation to resolve. If you find it's not the video card as IJAC suggested, I'd next swap out the RAM, then power supply.

 

Also there is a update causing problems KB4532693 security update check and see if you have this. The only thing that is different is people are losing any files or folders saved on there desktop. That is why I advise people not to save files or folders on the desktop save them in the documents folder.

 

KB4532693 would not cause the screen to to crash and turn black after a few hours of use.

KB4532693 hides the user profile so you see a desktop with a few icons but not anything that was put there in a particular user's profile.

Heat buildup? No, because then the computer probably would not restart and work. You'd have to wait until the system cooled down a bit.

Is it always the same amount of time that it crashes?

I'm looking at the update schedule, trying to see if one of those triggers the crash.
2 different Google Updates
2 different Dropbox Updates
OneDrive Update
3 different Adobe Updates
3 different WinZip update notifiers
Glary Update

 

In my opinion, Glary Utilities could be causing the problem.
A registry cleaner is a no go under normal circumstances.
If you are using this app, it is bound to cause an issue, sooner or later.