Small black square on the screen

Hello everyone,

I've been having a problem for a few days.

My screen displays small black squares that appear and disappear.

In games, I see colored pixel lines, flashes, and image flickering.

We can rule out the screen (tested on three screens, identical problem).

I did a complete reinstall of Windows, but the problem persists (recovering and deleting all files from the computer).

My config:

12th Gen Intel(R) Core(TM) i7-12700KF 3.60 GHz

32GB of RAM

NVIDIA Geforce RTX 3080 Ti

Windows 11 Professional

Has anyone experienced a similar problem or could guide me to solve my issue?

Thank you in advance,

Best regards