Why my MacBook Pro cannot connect to any wifi networks while there was no problem to doing that in the past p?

I used to connect wifi now I cannot. Why? Need to obtain new IP address and how ?

Hi Ole, and a warm welcome to the forums!
It could be a HW problem, but does it get many black bars in the Airport icon?
See if this helps hers...
Go to System Preferences
Click Network
Highlight AirPort and click Configure...
Choose “By default, join: Preferred networks”
Select her access point(s) and Remove all her access point with the minus button.
Launch her keychain access in Utilities and delete her access point keychain entry.
Reboot
Go back to the “By default, join:” page and click the plus this time to add your access point. Enter the correct password, save, reboot.

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