Mint 19 desktop no internet issue?

My mums Mint 19 was working until recently, her boyfriend tried installing zoom and the computer went black. But I switched the power on and off and it goes, except for the internet. It took a while to connect to the wifi but even so, Midori, Chrome and the updater are not connecting to the net, the browsers say there is no internet.

Could it be firewalld or Firejail, both installed?

Need a fix thanks?