no emails are on inbox on yahoo mails???

Although yahoo is one of the top email service provider, the mail processing has been problem form past several years. Even you may have some websites saying no yahoo emails as their servers have been blacklisted by yahoo for sending more emails than limited by yahoo. Gmail however do not have such problems.

I think it is just a problem with yahoo server as when it is very slow it happens that you will not be receiving the messages quickly, or simply why don't you change some settings in your yahoo mail and try to bring it back again just to see if it is okay. I have this in the past but instead of trying any other things I have deleted the account and created a new one.