Sorry for delay. I really hate to restart PC. :P

Anyway, little info from BIOS about CPU:
Freq: 3400MHz
Temp: 43°C
100MHz * 34 Multi
1.410 V

Mem: 2666MHz (2*8GB) - 1,20V

BIOS voltage senzor:

3V - +3,313V
5V - +5,041V
12V - +11,902V

CHKDSK log:

Checking file system on C:
The type of the file system is NTFS.A disk check has been scheduled.
Windows will now check the disk.
Stage 1: Examining basic...

28. Memtest86+ 20hours/9passes

29. HD Sentinel - missing picture

29. HD Sentinel

24. Prime95 test - 7-8 hours
30. Furmark - 1 hour (don't have pic of max CPU temp - was around 85°C)

My tests (pictures are numbered by representing number in "Ultimate testing suite 2018" from post #25 :D ), more coming up...
2.

Microsoft Windows[Version 10.0.16299.192]
(c) 2017...

Well, that is a lot of tests... Don't get me wrong, I will run them and post pictures and results. It will take some time (couple of nights just for some tests) but hopefully will get some promising...

Here it is...

I usully have Performance Power mode with Hibernation and Sleep off but did give cmd command a try with no luck. Also tried with Fast Startup on and off but don't think that have any impact on my...

Problem with my PC is kind of same but little worse.
From time I press power button till desktop is nearly 5 minutes.
What I did try:
- disconnecting everything except SSD, monitor, keyboard and...