I have exactly the same problem was freeze, black screen, design elements 7-Ki 10-ke.
in 5-6 seconds and all this mess stops.
And I have just a few seconds it droops.
And after the glitch fails AMD Settings. Only the browser is not Chrome, and Firefox. Graphics card - RX460. Could not catch the reason. Sinned on the videocard, but the problem is that during heavy 3D games had no freezes, no glitches. Even replaced the PSU to prevent with the old FSP on the new Corsair - did not help. The system re-installed again ...TSAT - tried W10 - Home, Pro, and LTSB. Even installed 7-ku, but to use it failed for unexpected reason - wild tearing in Firefox and in other browsers which are not able to win. PC clean, no dust "felt" no, I watch it. And here, once again, decided to reinstall the system on Ubuntu (I'm not a fan dualboot, I have a principle "one computer - one OS"), at the time of selection of the boot device, I still caught the artifacts in this picture:
When moving the mouse cursor, the image is scattered on squares. In General, recorded everything on photo and video, recorded on a disk and handed over to the graphics card under warranty with the drive. Now here's the good old standby of the computer waiting for the verdict of SC.