Most of us might be facing a problem when you sign your yahoo id in yahoo messenger 10 and a Pop message appear on window : "Yahoo! Messenger Troubleshooter" --- We can't sign you in to Yahoo! Messenger ...
This yahoo messenger issue arises due to following reasons:
1. Your network connection is slow. ( Refresh your network connection in my network connection)
2. Your yahoo id being logged in yahoo mail or third party yahoo software's. (Which resist your yahoo id to be logged in yahoo messenger )
3. Or some yahoo id crackers are trying to loggin your yahoo id by trying multiple passwords.
If you cant login your yahoo id , try the following steps.
1. login first your ID in www.yahoomail.com.
2. log out the ID.
3. login the ID in Yahoo messenger 10.