Suddenly my laptop will not connect to building router(s)

Yesterday, it was working fine but suddenly my laptop will not connect to building router(s). My apartment building is wired with routers for WiFi. lost the connection to the system. My other computer works fine.
Mapping shows the broken connection and the the computer indicates the WiFi cars is working fine. I even performed a complete reinstall.

 

When you click on the Internet connection icon in the lower right corner of the monitor, do you or don't you see a list of available wireless networks? If you do, is the one from your building there?
And if so what happens when you try to connect to it?
Please provide exact error messages and screenshots.

 

It does not connect to the router so I don't have any wireless connections as before.
I get computer....line X....line router.
(If it does not connect to the router how can I get any available nertworks? No error messages just no connection.

 

You should be able to view all network connections that the wireless chip "sees" when you click on the network icon near the clock even if you are not connected to your router.

Do you have a wireless icon? If not there are three possible reasons why after a reinstall: a) the correct drivers are not installed b) the wifi is not turned on c) the wifi is broken.

 

The WiFi must be broken. I can use a USB plug in adapter.
Correct driver is installed.
System is turned on.