Question Screen goes black.

Dec 26, 2020
Hey everyone, first off, i want to wish everyone a happy and healthy 2021! Now for my issue, i have been struggling with this issue for months now, tried everything i know off but can't figure this problem out.

September last year i bought a pre-built PC (yes, i know) with an i9 and 3080 GPU (Gigabyte) and everything was looking great until this issue happened where i would watch a video on MPC-HC (both .mp4 and .mkv files) and both my monitors would go black for a couple of seconds (like when you install a GPU driver), sound would still go on and the screen would come back but with the video audio still playing but no video.
Now i send the PC back for them to fix the issue but when they send it back, the issue would still remain. I got my money back and build my own PC. Surely that would get rid of the issue. Nope.

The PC that i built also has an i9 but a different 3080 (EVGA).

The black outs only happen when i am playing a video file, not when i am watching YouTube, Twitch, Netflix or when i am playing games.

Now i have replaced almost everything. Replaced the stock DP cables with DP 1.4 cables, tried 1 monitor DP and other HDMI, replaced my mouse, keyboard & headset, replaced power cables and power strip. Still the issue remains. Tried different video players, changed the power settings in Windows 10.
Everything that i have tried Googling has not worked. Weirdest thing is that if i try it on my older PC (i5 and 1080) this issue isn't a thing.

The 2 monitors in question are Acer Predator XB271HU (1440p, 144hz) and LG 27UL850-W (4k, 60hz) so maybe it has something to do with the different refresh rates? Weird tho that it is not happening on my older PC. Is it possible that it can't get enough power? But it doesn't happen during gaming when it sips a lot more power.

Sorry for the long write up but i wanted to give a detailed story on what is the issue exactly.

Hopefully someone can provide me with the magical fix because i am getting pretty tired of this issue.

Thanks in advance!

EDIT: My full specs:

Cpu: Intel Core i9 10900K

GPU: EVGA 3080 FTW 3 Ultra Gaming

PSU: CORSAIR RMx Series RM850x

Motherboard: Asus ROG STRIX Z490-E GAMING

Memory: Corsair Vengeance LPX 2x16 GB

Seagate Barracuda ST4000DM004 4TB

Samsung 970 EVO Plus 2TB
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