PC display is blinking - Turning off and on again in intervals

Let me start by saying this is something that has been happening since I first built my PC a couple of years ago and it's been a real mystery to me since then... Let me explain why.

The issue

My PC monitor blinks at random times. The screen starts turning ON and OFF again in approximately two seconds of OFF intervals, with less than one second ON time in between. This continues endlessly and usually gets resolved after I remove the connection cable and re-insert it, or when I turn the monitor OFF and ON again.

I have recorded two videos to better demonstrate the problem:
https://www.youtube.com/watch?v=dX4OQ8cBygc
https://www.youtube.com/watch?v=deWqW5J47hY

Under which circumstances it happens?

The issue appears randomly and in infrequent times. Doesn't matter if the PC is idle or under stress and happens in any screen, even on the BIOS startup screen. Sometimes appears multiple times in a single day and sometimes takes a couple of days to re-appear.

What I have tried

There's really few things I haven't tried already...

• I have replaced CPU, CPU cooler fan, PSU, GPU, SSD, RAM and Motherboard (kept same model though). I have pretty much replaced the whole computer except from the PC case.
• I have tried different HDMI cables (happens on Display Port too)
• I have tried on my 4K TV as well as on my Full HD monitor, happens on both
• I have tried on Windows and on Linux (Ubuntu), happens on both

Current setup

All components are new and nothing has been overclocked.

• PSU: Corsair RMX White Series (2018), RM850x, 850 Watt
• CPU: Intel Core i7-9700K
• GPU: GIGABYTE AORUS GeForce RTX 2060 SUPER 8GB
• CPU Cooler: Noctua NH-D15 chromax.Black, Dual-Tower CPU Cooler (140mm, Black)
• SSD: Samsung 970 EVO Plus Series
• RAM: Corsair Vengeance LPX 16GB (2x8GB) DDR4 DRAM 3200MHz
• Motherboard: MSI MPG Z390 Gaming Edge AC
• PC Case: Fractal Design Meshify C

Questions

What could be the root cause of this issue and what else can I try to narrow it down? Does this seem like an electrical short circuit? And if so, how can I verify or detect its source?

I would appreciate any help...

Have you tried any other devices or computers with your monitor and TV? Have you tried your computer at any other place?

Problem looks and feels odd, like monitor/TV failure or GPU failure. But since you have changed GPU and tried with different displays those should be OK. You have tried different cables as well.

Another thing to look into is overclocking. Have you checked all the settings that there is no overclocking for CPU, RAM and GPU?

And at last but not least, is it possible to measure voltage between PC and monitor/TV? They might be plugged into different phases and there might be some difference in voltage, that might interfere. If they are plugged into the same wall outlet via extension wire, then this is not the case.