Windows 10: Everytime i turn my PC on it goes to a grey screen, any help?

Everytime i turn my pc on it kept turning to a grey screen, i kept restarting it and it eventually let me log in, but soon after it went grey again. the only apps i had open were steam and discord when i went on. discord was updating and so was steam. i have turned my monitor on and off but i do not think its that. I picked the monitor up yesterday at currys, its brand new. i just asked for the best in stock. While on the grey screen it doesnt let me do a single thing. not even alt+f4. any help?

:)

 

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??

 

Win 10 won't boot after screen goes grey.

I did almost everything like you wrote, except

select partition 3
detail partition
select partition 4
detail partition
select partition 5
detail partition

I only got two partitions so I thougth this was not nescesery. I hope I was correct.

Here are the results:






















Then I rebooted, but the result was the same as in first post.

And here are the results for the last four commands:




Again, reboot and same thing.

BTW, I booted from USB stick with the Win 10 that I have used to instal that version of Windows. All the commants in command prompt was done int the command prompt from USB stick. Was this ok, or I should have use command prompt from installed OS?

 

pc turns in and goes to a black screen