Blazing graphics errors when booting from the laptop?

For some days strange graphics errors flash on my screen at startup, for less than a second. It comes the "Lenovo" lettering, then it flashes briefly. Finally, the notebook goes up normally and there are no other errors. Incidentally, the pixel heaps are not always the same.

My system:

Lenovo Y50 with 16GB RAM, Intel Core i7, NVidia GeForce GTX 960M and Windows 10, used by ebay, I replaced the display myself with the following:

https://www.ebay.de/...2424911739

After display exchange, everything went without error, but now (about 1 1/2 months later), this error occurs.

Of course, it does not affect anything, so it's not bad in itself. But I get a little bit of a stomachache every time I see that… I'm a bit worried that this might be something that is developing and getting worse over time. Getting rid of it would be great, but I guess it's more of a hardware bug. The small cable is actually safe on the display. Maybe lack of compatibility or something? Does anyone know this problem and can tell me if it is rather something "harmless", so it remains, or if it could spread. Can you prevent that?

Pictures are screenshots from mobile videos so a bit bad.

Reproach that you do not buy on ebay or that you should not mess around yourself, bring me no further and can you please save.

MfG xara99.

Uninstall or update video drivers