Posted 1/6/2019 06:15 (#7223697 - in reply to #7221746) Subject: DNS issue?
Since you did not say other web-sites can not be found as well as Yahoo, you can check off the DNS (Domain Name Service) as being okay.
I suspect DNS is part of the issue, however. Double-check the links you're clicking has no spaces or other changes from Yahoo.com in it. With improvements in DNS, you no longer need HTTP:// nor WWW in the lead of your web-addresses. Right-click on the Yahoo icon, look at the properties. Even an extra o or an errant space can nix your way to the site.