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If clearing your cache and cookies did not resolve this issue, then you will need to try a different browser to see if that helps. The homepage news changes constantly so it should never stay on the same content from one day to the next.
Another cause of this isssue would be if the Yahoo! Homepage is your browser's homepage and your browser is not allowing that page to update correctly. If this is the case, using a different browser should resolve this problem.
If using a different browser does not resolve the issue, then you should make sure you are actually visiting the real "yahoo.com." There have been instances of hackers creating false pages to steal page views and advertising revenue from large corporation, that look similar to the original but do not behave the same. You may also want to run a virus scan or several, as the behavior you've described is highly suspicious.
I hope that helps! Please let me know either way!
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