To get started, I need to know what type of computer you are using, a Windows XP, Vista, Windows 7, Windows 8, Windows 10 or a Mac.
If its a Mac, please check the OSX version as follows, Click the apple sign at the top left of your screen, then click about this mac. And then where it says version, send that to me as a reply.
Also, can either your phone or your computer still sign into yahoo? And on your computer, how did you previously access Yahoo, through your browser or through an email app such as OUtlook 2013, Thundrbird, Mac Mail, Windows Mail, etc?
Senior Technician and Network Switching Systems Operator / Maintainer.