*Sorry if i will sound a bit pissed off. I appreciate any help. I am just pissed off about that problem, not you.
My thoughts on this are.... have you added a battery backup and powered the monitor and PC through the battery backup? If you have a quick fluctuation in power it can cause a monitor to act up but a PC could keep running because the capacitors in the power supply were able to smooth out the quick dip and rebound of power.
No, i don't have a UPS. But, and there is a big BUT. I hoped that i mentioned that in my main post, that on my first monitor that i used up a lot as it was breaking down, i have found the pattern. It only went black when a specific color ranges were displayed. It's hard to explain. So please try to follow.
I have found a specific scene in Fallout 4 (as it was in this game where my first monitor had shown the signs of the problem), where i could recreate this problem anytime. I made a save file in that spot, and was testing things by just loading the save file and... waiting.
That was before i just took a screenshot from that scene and recreate the problem viewing that screenshot on the monitor using laptop (that is how i found out that it was a monitor fritz and not the PC software/hardware).
So. I could recreate the blackscreens anytime with that scene. Any... time... So it probably not just a random voltage drop, right? But wait, i have more. I even could stop the problem by droping the brightness on my monitor to minimum. That changed the colors just enough to stop the screen from turning off.
And while you could say that by dropping the brightness down i was changing the monitor power consumption, and so - preventing the problem that was power related.
BUT! Yes.. even more buts. And yes, i may sound silly but this is exactly why this problem is driving me nuts.
So... even tho this scene stopped to cause the problem to appear, then i could go to a place that was a little better lit in game, and the problem would appear again. Or i could just bring the brightness higher in the game options and it will do the same - screen will start to turn off and on again.
And while we are on this topic - the dynamic contrast was turned OFF all the time. So the monitor wasn't manipulating it's backlight brightness depending on the scene. The backlight brightness was statick all the time.
Also, when i was recreating the problem, it went in cycles. So at first i needed to wait a bit. At the beginning i was waiting up to 20 minutes, but as things went worse - monitor would start to go black in 2-3 minutes at the test scene. And after it went black once - it will start the cycle and will be turning on and off each 15-20 seconds or so. Unless i change the scene.
Also, if just switch monitor off for 20-30 seconds, and then turn it on again - i would need to wait a few minutes before it will start to go turn itself on and off again on the test scene.
So it was like if it was overheating. But even if it did - remember, that it was just one monitor. One from many that started to behave similarly after a short time of use. And all the new BenQ monitors don't even heat up noticably - they are LED and very power efficient.
So from this you can clearly see that, sadly, it wasn't just fluctuations in power. I mean - i could summon the problem just by viewing a particular image for long enough. And for a few months!.. The monitor WOULD NOT go blackscreen while i was watching youtube, or wrighting some documents in Word. But as time went on - the problem worsen, and it started to go blacksreen in many many other scenarios. To the point where i can no longer use it.
Also there was time not too long ago when wiring on a lower floors of the building caught on fire... It was evening and i was near my PC. When the light in my room started to flicker as the power was dying - my monitor and PC worked just fine. I turned them off immediately ofc. But my point - when the power actually did noticably dropped, the monitor (it was my third BenQ) was keep working. And it is not a big surprise as they are declared to work in 100-240 voltage range. And the main voltage standart that is used in my country is 220 volt. So there is a huge wiggle room for that.
This is freaking me out so much... I am almost ready to believe in magic and curses, and Gods, and Cthulhu mythos. It just so... strange. I dont know what to do.
This kind of problem had NEVER happened to me before in all 15 years that i used a PC...
If there is some unknown problem with power delivery and somehow it only effect my monitors - i would need an expansive "Double conversion UPS" as they call it. That basically will keep powering my monitor from the battery all the time. But it's a huge investment and i don't even know if it will solve the problem. Regular UPS will just send power to monitor directly from the on wall power socket, which will not help if the power has some bad properties (like amplitude or frequency).
I also thinking about buying an HDMI to VGA converter, so it would convert the signals from my PC so if it somehow is killing my monitors via DVI and HDMI connections - it should shield it.
I am desparate and want to cry... This is so stupid and surreal...
