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OKay, First of all very sorry to hear your having this issue.
Secondly, the troubling part is that Yahoo does not offer ANY phone or LIVE support for their FREE email accounts.
They have millions upon millions of them, so they just dont support in that fashion.
So, thats where i come in, i would liek to look through the settings, maybe you have some AV or FW blocking or your network is causing the issue.
But to do this, i need to connect to your ocmputer, through a remote session.
If you are ready to do this, let me know.....as it will take about 15-30 min to complete.