Οk, so here we are still fighting with that problem.
I am still not convinced that my monitor shows correctly the dark grey (almost black) colors...
Today i got a calibration device which a tried.
The results seem to be pretty fine. Unfortunately i don't have the screenshot of the second mesurement , although the results of the first are pretty much the same (a bit worse cause of the ambient light).
Of course there is something weird that happened. After the calibration, the exported profile was really messed up on whites. It reduced the Kelvin dramaticaly making my monitor yellowish. That something i cannot understand.
The rest shows to be fine. Although i am still convinced that there is something wrong with the dark greys when i compare it with many other monitors where i can see all that dark information and in mine its just a plain black.
So here we are.
Results:
Total black:
Pretty black

Here is my monitor with the default profile for white: 7300 K (I got my monitor set on 6500K)
And here with the yellowish as suggested from the device: 5000 K (I got my monitor set on 6500K)
The profile did surely not fix anything in the dark greys. On the other side it turned my white into a very warm white.
An example image is the following that i see totally different on other monitors.
Inside the big red circle there is some information of shadows and other patterns the metal does.
On my monitor that is a solid black color. Do you see the same ?
Any kind of help would be highly appreciated. I honestly don't know what to do anymore and i am afraid of editing my images on that monitor.
Thank you in advance
PS. Just did a further test in photoshop. I put RGB in a gradient in following 0,0,0 next to it 2,2,2 and last 5,5,5 . From 0 to 2 i could not see any difference, just from 0 to 5 . So that i could see some difference i should increase the gamma on my nVidia panel to 1.4 , which washed all the other colours out.