Laptop does so as if WLAN would not exist?

When I logged in to my laptop again, he had a crossed-out Internet icon instead of the Wi-Fi icon, which usually means he has no Internet connection. But no. More than that. He shows me no Wi-Fi, instead, there's only the request; I should go to the network settings please. I went to the network settings. There I could find also no WLAN. Obviously, the first thing I did was to look at my phone and see that the WLAN is working properly there.

Look if you have disabled the wlan function on the notebook. Fn key and one of the f keys.

Which operating system?

I pressed the fn key and f3, and nothing happened.

Flight mode is hopefully off. And Wi-Fi is hopefully enabled (Fn key, F2, …).

And you've already "shut down" Windows correctly and restarted.

See if the wireless adapter (wireless… Device) still appears in the Windows Device Manager as a workable device.

Possibly. Windows start in "safe mode" and see if then the wireless and the wireless adapter in the device manager exists.

Otherwise, follow this guide at Microsoft:

https://support.microsoft.com/...ion-issues

PS:

Of course it can also be that your wireless adapter is simply / unfortunately broken. Then install a new adapter or use WLAN stick.

Thanks for the detailed answer. Fortunately, everything works again at once. But thanks anyway.