Windows 10: Pc turns black screen, monitor shows resolution changes to 1920x1078 and restarts

This started happening like 3 months ago, my pc is I7 870, R9 380 4gb 8gb ram and 400w psu, i dont know whats the cause im asuming its hdd its like whenever i run anything all time 100% and pc is turning on ~6 minutes i changed cpu 5 months ago i dont have good cooler for it but it never goes over 80C when it turns off, i ran some games to check will pc turn off like fortnite put it to 92 at one point and nothing. I did Furmark on my gpu everything is good also my psu is 400w and i think its not the problem since its been working before that. Im starting to get worried, everything literally everything could be, cpu, motherboard, psu, hdd, ram... Im thinking about trying to pull off 4gb ram sticks i added a year ago maybe they are the problem,

:)

 

Issues with the second monitor as it shows black screen

Original Title: Second Monitor Black Screen

Hello,

I am running Windows 10 with a 1920x1080 resolution monitor connected via HDMI. I recently connected a second monitor via VGA with an unknown resolution (Windows usually defaults it to 1024x768). After a bit of messing around I was able to get both monitors
working via Extend Displays. However, I changed the resolution on the second monitor, leading to it going black. I tried changing the resolution back to how it was but nothing happened. The monitor itself is fine and when I change other settings (show only
on 2, duplicate displays) the monitor works and displays everything fine. It only doesn't work when I extend the display. I have tried changing the display to different resolutions (higher and lower) and nothing happens (the main monitor works fine). I tried
disconnecting everything but nothing works. Is there some sort of solution to my problem?

Update:

I restarted the computer and the first two screens (the manufacturer's logo and the first loading screen) appeared on both monitors, but after that the second one was black.

 

Second monitor screen resolution problem

Hi,

For us to properly isolate the issue with your second monitor screen resolution, we would like to know the following:

• 
  Were there any changes made on your computer prior to the issue (e.g., updates, software installation)?
  
• 
  When did the issue first begin?
  
• 
  To make sure that we have not missed on anything, what troubleshooting steps have you done so far?
  

In the meantime, we suggest that you try resetting your monitor settings, and check if the issue still persists. You may refer to your monitor on how to reset it.

We look forward to your response.

 

Resolution changes on restart

My display resolution changes everytime i restart my pc.

When i shut down my pc and then turn it on,the resolution is normal

I need help, i have the latest drivers.

I want to change my default monitor resolution to a higher one