I encounter this problem on a PC and on a laptop

[Murets]

I encounter this problem on a PC and on a laptop, both without SSDs, but with good specs in general (i7 8750h, 32GB RAM etc). I have a legit installation of W10 on both.

When I turn on the PC/laptop, I see a black screen for a long time (3-10 minutes, usually) before seeing the screen that requires my password (or pin or whatever). Sometimes, I see the mouse on the black screen, but that's all. Sometimes, the screen is completely black

Why is this happening? How can it be fixed besides going back to linux?

[beast2040]

In ASTER you can send a technical report to technical support. Do this and describe your problem.

[jogbatter]

You should run a memory test using Windows Memory Diagnostic