My home network's wireless SSID is say "XYZ"

I also have an ethernet wire from the same router.

I have two laptops A and B

Earlier both A and B were able to connect to my home internet through the ethernet and wireless.

Suddenly, the laptop B can no longer connect to XYZ or through ethernet. When I do plug the wire, i get the connection icon all green but when I try to access any web page it errors out (page not found)

But strangely laptop B connects to my neighbours wireless SSID "ABC". I have also tested laptop B with other networks and it connects fine.

Laptop A and many other devices still connect fine with my home wireless "XYZ"

Strange thing is when my laptop B connects wireless through XYz, it gets the IP address but then none of the browsers (chrome,firefox, IE) can show any web pages.

What settings should I be checking on laptop B that is preventing it to connect to my home internet.

Thank you