If I put my laptop back, then is the WLAN defective - problem fixed?

Would that work?

No, I do not think so. I'm not such a pro, but you can give it a try. But put off everything that you have stored on it on a memory card or something. Or you first enter the wlanpasswort again.

It all depends on what causes the problem and how it expresses itself. Unfortunately, you have not given any information about the latter, which is why the former is impossible to find out.

What is the problem with the W-LAN?

I can't connect even though the code is correct

First, check if your keyboard has changed to English. This happens through a certain combination of keys while playing, etc. By mistake.

At the bottom right in the taskbar is a small box where "ENG" is. If you click on it, you can put it back in German.

If you enter a password with English layout, which often contains special characters, you enter it incorrectly in 90% of the cases, because the special characters on the US keyboard are arranged differently, just as the Y and Z are reversed.

Ehm!

Please explain. What is broken on the Wi-Fi.
What EXACTLY does not work, how is the error expressed and since when does it occur.

OK. Next you can try to reinstall the W-LAN module.

In doing so, you proceed as follows:

Search → Device Manager

Network adapter → (Your W-LAN module, there's usually something of it because of W-LAN)

Right-click on the WLAN module → Uninstall device

Wait until it's done.

Now the W-LAN module would have to disappear from the Netzwerkadapeter menu and somehow appear above with a yellow little exclamation point.

Then right click again → Properties

At the top then on the tab "Driver" and then on "Update Driver". Then you just confirm everything he shows you and he should automatically search for the driver and reinstall.

If it still does not work, you can really save your data and reset the laptop as a last try.

If it does not work then your W-LAN module probably has a hardware defect. But I do not think so, because that would express something else.

I'm now with the network adapter and I have 2 names what do I do then?

So now I have both names uninstalled but there are no exclamation signs

Okay, then it behaves untypically, not bad, then just do the two names that I originally wrote for the exclamation marks. The procedure is the same.

I do not understand that exactly! The names and the network adapters do not exist anymore what do I do now?

Which operating system? Windows 7/10, Arch, Ubuntu?

Do you think you can post a screenshot from your device manager? That would make it easier. Otherwise you have to start guessing.