@manolis kokotsakis
1) The "Critical Process Died" error problems began when you replaced your monitor (screen) with a different monitor (screen) and then the problem went away when you put the original monitor back. Is that correct?
2) And there have not been any "Critical Process Died" errors since you put the old monitor back - is that also correct?
3) And you do not believe that the problem is the PSU despite multiple posts with that concern - correct?
What is needed is to find more error codes and warnings that may help diagnose the problem. There are several ways to do so and some of those ways have been suggested.
Here is
what you must do if you wish to learn more about the possible reasons:
Open Reliability History/Monitor and expand the window so all can be seen. Note the "View by" choice. Select
Weeks.
Here is a link to explain how to do that:
https://www.computerworld.com/artic...ting-windows-10-with-reliability-monitor.html
Note: the name can and does "change" between History and Monitor. Just ignore that the name changes.
When you have the Reliability History/Monitor window open and fully visible take a screenshot and post that screenshot here via imgur. Follow the imgur instructions/link provided by
@Colif in Post #17.
You must be: 1) fully sucessful in opening and running Reliability Monitor/ History, 2) able to take a screenshot of the Reliability History /Monitor window, and 3) be able to post that screenshot here via imgur.
The objective is to look at the errors etc. being captured by your system during the last two weeks after the original monitor (screen) was put back into place. If you remember be sure to post the dates you changed monitors.
Stop with that - do not and avoid making any further system changes. When you change too many things that causes confusion and makes troubleshooting very difficult.
= = = =
The next test, if needed, will be to put the new screen (monitor) back into use. Watch if the "Critical Process Died" errors return.
If the "Critical Process Died" message returns then you will reopen Reliability History/Monitor and take some additional screenshots. Those screenshots may provide more information about what is happening.
Other tools (such as Sysnative BSODCollectionApp) may then be used to learn more about the problem, the cause, and how to fix the problem. However, only you will be able to do those things and then likewise be able to accurately and fully post the results.