Strange Problem Gaming PC!

[Oltor]

Hello! i need a smarter nerd. my PC have a very annoying problem that i cant solve.

At random the active screen loses connection/blinks out for 0,1-5 seconds then comes back. now this happens 1-4 times if i use the pc for 4h. a normal night after work.

i have three screens, only use one at at time depending on what im doing

The monitors: 

-32" Asus gaming monitor, short displayport cable. not used much since Elden ring, but back then the problem was not very noticable on this screen. just a small hickup in FPS
 
-60" Samsung Tv, short cable, dispalyport adapter to HDMI. the problem lasts for a few seconds here, and its very strange, VLC/netflix loses fullscreen, and mouse pointer is show, and kinda glitches a few times, then its back to normal.

-Projector. very long HDMI cable, 20meters, when the problem happens the Projector goes black for a few seconds, comes back and goes away a few times, then the screen becomes totaly pink before it returns to normal. 
 one time the when the problem happend the PC restarted (old GPU)

i have noticed that the fans speed up when the problem happens, so i ran the PC last nigth w the fans at 1000rpm minimum curve (was 0), but the problem still happens.

it feels like the problem is slowly getting worse. happens more often now than 6months ago.

the retailed said it was my GPU, so they got me a new one. from MSI 3080 sheahawk to a MSI 3080 12gb. that was nice because i dont like AIOs anyway. 
it seemed fine for a few days then it slowly started creeping back to just as bad, but abit diferent in how it looks when it is glitching, but still the same.

i have reinstalled win10, no change, updated and downdated gpu drivers.
power saving modes are off, no screen saver on or anything like that.
updated win10.

ASUS ROG STRIX B550-I GAMING

AMD Ryzen 9 5900X 3.7 GHz 70MB

G.Skill 32GB (2x16GB) DDR4 3600MHz CL14 Ripjaws

Cooler Master NR200P 

Cooler Master V850 SFX Gold (V 2,0 i think)

Msi RTX 3080 12gb

noictua/arctic fans

commander pro.

other things i have done w my PC: 

-turned CPU fan check off in Bios, all fans are connected to the commander pro.
-XMP profile on, nothing else is overclocked.
-deshrouded GPU. how has 2x 140mm Arctic P14 fans.

-cpu/gpu Temps are at idle 40-60c. and max out at 70-75c after heavy workloads.

could it be a broken Motherboard or PSU? and perhaps whatever is causing the problem is now eating my new GPU? or did MSI just make junk GPUs? :S

 

or do i have some virus? or some shit like that?

 

Please help! this pc was perfect... the best i have ever put together, finally felt like i had grown up and built something smart for once, and i have built alot of PC's.
Its ultra silent, very well cooled, small and clean looking. but it has a disease thats growing and nobody so far knows what is wrong.

 

 

 

//Oskar.H Sweden.

 

[191x7]

1 hour ago, Oltor said:

Hello! i need a smarter nerd. my PC have a very annoying problem that i cant solve.

...

I've seen such issues. Don't take it for granted, but there's a high chance it's the power line.

One of my monitors is susceptible to power fluctuations, when I turn a vacuum cleaner in the next room, it looses signal for a few moments (goes black).

Try with an UPS, if the short blackouts go away you'll know.

You can try on different wall outlets too.

 

[Oltor]

interesting, i will look into this

[Oltor]

It still happens when i use UPS for the screens, other suggestions welcome!

[Robchil]

DDU uninstalled the GPU drivers? . before downgrading. 

[Oltor]

yep, no luck

[Oltor]

i have perhaps solved it, i read on some random google search about someone w a similar problem, new paste was his solution. so i removed my CPU cooler and saw it had a dry spot in the paste. some new paste on and put it back together, no problems last night. 

temps where always very good tho, so it feels strange. can one small spot overheat and not register? and cause weird problems? :S