Windows 10: PC gets black screen everytime after I close a stress test

As the title describes, in cyberpunk my PC would randomly freezes around a few minutes into the game into the game but audio still works. So I wanted to check things out, I tried furmark for around 15 minutes and didn't see anything out of the ordinary. However, a few seconds after I close furmark my screen would freeze then turn black and my monitor would show no signal. This happens consistently without fail no matter how long I stay in the stress test even if it's just 10 seconds. It also happens in unigine superposition stress test in the same way. I have tried DDU and reinstalling the gra

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New laptop hardlock with black screen

I have a new notebook, running Windows 10 Fall Creators Update, which is randomly freezing, showing a black screen. System specs:

• intel core i5
• HD is an SDD, 250GB
• GPU: Intel HD graphics 620

Symptoms:

• happens randomly, related to no particular reason, time of the day, and programs running
• when freezes, the notebook screen is "active" (back light is on) but completely black; external monitor, connected via HDMI, is black as well
• when freezes, no key input is responding. I tried to press "CAPS Lock", which has a led on it, and the led is not toggling
• I noticed I can keep the PC on for several days, without any problem. It always freezes whenever I'm actively using it

What I already tried:

• reinstall Windows from scratch (even starting from an external USB drive)
• run windows in "clean boot" mode (all non-MS services disabled, all startup programs disabled)
• update the BIOS, and all "relevant" drivers (GPU, System Firmware, network interface, bluetooth, ...) of the PC to the latest version
• testing the memory with MemTest86+: no issues, after several steps
• stressing the GPU with FurMark: reached quite an high temperature (70°), but no issues
• stressing the CPU with IntelBurnTest: reached quite an high temperature (70°), but no issues

Now, I would guess it's an hardware problem, but the strange thing is that we ordered 6 identical PCs, and this is happening on 4 of them. Therefore, for "statistical" reasons, we don't think it could be possible that all of them shows an HW issue... It only happens with a different rate from one PC to another (for instance, happens daily on my PC, and once a week on another)
Any idea on how to investigate this issue further?
Any test / improvement I can do?

 

Nokia N97 Stress test

If your wondering about buying a N97 device look at the stress test. My friends over at N97geeks.com have done.



- scrach resistance scrached the screen with a coin and a key

- they put the device ina ziplock bag with coins and keys.

- scrached the paint and keys with a coin and a key

- dropped the device in milk and washed it off under running water with soap



theres more tests to come.



Nokia N97 Stress test

 

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??