Screen turns white-grey, blue, randomly how to diagnose the problem?

Hi, my screen turns white randomly while using it. I can't tell you when this happening but sometimes while unplugging the USB drive or working on Adobe products (Ps, Ai, Id, etc) sometimes watching video on the browser or just while to work on Explorer or Finder or on Netflix. As I said it's happening randomly sometimes no problem on a week then suddenly coming back. When this happens I am making force restart from the case. BTW it's not fully white its look like whitish-grey, blue or light green. But mostly is whitish-grey.

Anyway, first I thought, maybe my graphics card faulty (I were using GTX 660 back then) And I bought a new graphics card RTX 560 and nothing changed. Same time I upgraded my CPU and Motherboard also. But it didn't help.

I also added a new OS for a test and turned the whole system to Hackintosh. (I installed High Sierra and Mojave) But the problem still continues.

Ohh! I was almost have forgotten the most important part. My Display.

(https://www.amazon.com/HP-2711x-27-Inch-...)

I am using HP 2711x 27-Inch LED Monitor. I know my display is old for these days. This screen has 3 ports and I tried all connection type for this problem and none of them didn't help.

Just one part I didn't upgrade on my system, of course, it is Display.

Nowadays the screens are very expensive, at least what I want. But I tested the screen on the TV connection. I connected the screen to the TV and this problem never happened on TV connections.

I am still not sure this problem came from Display or settings or other parts which I upgraded all parts recently.

What I want to know when this problem comes how can I diagnose this problem on both OS. (Mojave or Windows 10). The screen turns whitish-grey and I am making force restart from the case. After opening the OS where should I look? How to diagnose this?