Lenovo notebook does not boot Win10 installation?

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I have a huge problem. I should install my grandma Win10 on her Lenovo Z50-75 (with Win8) (Win7 has been installed before). Has everything worked, however, after the first reboot a screen came from Win7: "Shutdown" after turning it back on, the Lenovo logo appears, a dash flashes briefly and then it stays a while black until it turns off again.

I need help fast and urgently, otherwise I'm crazy

Many Thanks

Would this notebook be: https://www.heise.de/...26040.html

(No virus)

I need an answer or feedback as soon as possible!

Ky

How did you do the installation?

Bootstick or Windows Update Tool / Media Creation Tool?

Was a backup made?