Yahoo mesenger sign in problems?

I've looked on yahoo messenger help and have tried changing my connection preference.I still can't log on!Help!

Yahoo mesenger sign in problems?
If you are connected to the internet, have the correct username and password, and still can't log in, reinstall y mess.
Reply:happened last july too, messenger wo't let me in again too. Be patient, try sending an email to your buddies let them know your trying