I SUCCESSFULLY DOWNLOAD YAHOO MESSENGER BUT I CANNOT SIGNED IN

You disconect fromchat because you signed in the yahoo messenger
Messenger is a different applicatio from chat. yahoo considers the user of the application as different, so yahoo disconects you from one application from the other

Welcome to FixYa

• Check your Messenger is Sign in at the Time of Sign in to Yahoo mail
• Check in MOBILE phone/any other Device as you Signed in
• Check in any other Browser as you Signed in
• Check any other yahoo account is Signed in your Computer
• Restart your PC
• Sign out from Mobile/any other Device

Yahoo has prevented us from having 2 Instant Messaging capable programs open and active at the same time.
For example, Yahoo Messenger with Yahoo Mail or Yahoo Web messenger, your mobile phone, Ipod, or other computers etc. etc.
Yahoo classifies all these programs as "Different devices or locations". Navigating from one to the other will close one program and you may get the notification message you refer to.
OR someone has hacked into your account- Report to Yahoo and Try to Recover it-Send report Politely and concisely.Do not try to Send More report for Same cause..
If this Helped -Rate ME...Thanks for Contacting FixYa

Hi!

When you are online with Yahoo Messenger and at the same time sign-in with your yahoo mail account, Your connection with Yahoo Messenger will be lost(and it will sign out automatically) when you tried to open your mail chat.

Or if your status is " Available " on the mail chat of your Yahoo Mail account. Once you sign in on this account, you will be signed out in your Yahoo Mesenger account unexpectedly.

So, here is what you need to do.

Sign in with your Yahoo Mail account. On the upper part of the page, beside your name, click sign out of chat. The message should appear "offline"
Now try signing in with your Yahoo Messenger account. Then after signing in, view the content of your yahoo account. It will not disconnect the connection of your YM.

Let me know if that solve your problem. Please come back and give me some ratings.

Thank You for using Fixya!

Right now yahoo! is facing some server problems. All we can do is wait for them to make the necessary repairs and restore out yahoo! accounts. I also answered on your other post of this problem.

"You have been signed out out of chat because you have signed in on another device" ?

Hi,
Since Messenger Version 9 was launched, Yahoo has prevented us from having 2 Instant Messaging capable programs open and active at the same time.
For example, Yahoo Messenger, Yahoo Webmessenger, Yahoo Mail, your mobile phone, Ipod, or other computers etc. etc.
Yahoo classifies all these programs as "Different devices or locations". Navigating from one to the other will close one program and you may get the notification message referred to above..
Note. Hitting the X on the Contacts page in Yahoo Messenger does not sign you out of Yahoo Messenger, it merely closes the contacts page. Like WLM you have to close the program by right-clicking the icon in the system tray and selecting 'Exit'
You can have Yahoo Mail and Messenger ( or any other program ) open at the same time as long as your status is "Offline" in Yahoo Mail. Use the drop-box next to your name and "Sign out of chat"
Your online contacts will vacate the inbox until you make yourself "Available" again

Yahoo Mail ?
"You have been signed out out of chat because you have signed in on another device" ?

Hi,
Since Messenger Version 9 was launched, Yahoo has prevented us from having 2 Instant Messaging capable programs open and active at the same time.
For example, Yahoo Messenger, Yahoo Webmessenger, Yahoo Mail, your mobile phone, Ipod, or other computers etc. etc.
Yahoo classifies all these programs as "Different devices or locations". Navigating from one to the other will close one program and you may get the notification message referred to above..
Note. Hitting the X on the Contacts page in Yahoo Messenger does not sign you out of Yahoo Messenger, it merely closes the contacts page. Like WLM you have to close the program by right-clicking the icon in the system tray and selecting 'Exit'
You can have Yahoo Mail and Messenger ( or any other program ) open at the same time as long as your status is "Offline" in Yahoo Mail. Use the drop-box next to your name and "Sign out of chat"
Your online contacts will vacate the inbox until you make yourself "Available" again

You cant have 2 instances of yahoo open at the same time, you'll be booted off of one. Yahoo also recently changed all of their DNS servers, and there was some login issues. The official Yahoo should have already been fixed. If you are logged in on your phone, you cant also be logged in at home.

A) A glitch.
B) You are signed in somewhere else.

Try it again. Also, if someone else is signed in to your account, you can boot them out by signing in yourself.

I'd change the password.

Please check if you have signed in the messenger elsewhere. Normally, Yahoo messenger doesnt allow to be signed in both messenger and mailbox.

Regards,
HP

Hi, we now have several locations that are capable of accessing the Yahoo Instant Messaging feature.
Yahoo Messenger itself, plus Yahoo Web Messenger, Yahoo All New Mail, My Yahoo, your Mobile phone, plus any other computer.etc etc.
Yahoo classifies all these programs as different 'locations or devices'
Yahoo currently do not allow you to have 2 open and active at the same time. If you have one open, and then move to another, one will close and you get a message telling you that you have been signed out. You CAN have Messenger and Mail open together as long as your status is set to "offline" in MAIL by using the drop-box next to your name and selecting 'Sign out of chat'. ( your chat contacts will remove themselves from the inbox until you make yourself 'available' again.)
Please note:
You may think you are signed out of Messenger when this is not the case.
Hitting the 'X' when you close the Messenger page does not sign you out of Messenger it only closes that page - you have to Exit Messenger by right clicking the icon in the system tray.and selecting 'Exit' I suggest you make this setting. > (left click) Messenger > Preferences > General - check box "sign out of Messenger when I close the main window" > Apply > OK.
If the above does not apply and you suspect your account is being used by a hacker. When you get signed out, close all your Yahoo programs and type your name into this software. Hit "GO" and hopefully it will show you as "offline".
If not, contact Yahoo customer services
http://detectinvisible.com/