Lenovo hangs after over 10 hours is prepared?

I had a problem with my laptop and wanted to reset it.

It was only 10 hours to see only a black screen and then appeared for 12 hours constantly the message "is prepared… Will be restarted" then the screen turns black again and then again "is prepared"

My question: how long will that take? Or did he hang himself? What can I do?

I had a problem with my laptop and wanted to reset it.
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if the problem still exists, e.g. Main memory error ect. Must first be removed. For this purpose, computers with external medium, e.g. Memory Stick started and while checking the hardware. This usually only make specialty shops

How do you know that it is a memory error?

Have a year ago my laptop ever reset and had no problems there.

That was just an example of what could be considered. Since he himself does not come to Windows anymore, it has to be analyzed. There are some diagnostic tools beyond Windows.

https://www.heise.de/...re-analyse