Table of Contents:
  Introduction
  Step 1: Test Your Internet Connection
  Step 2: Verify Your Yahoo! ID and Password
  Step 3: Test Your Access to Secure Pages
  Step 4: Verify Credentials
  Step 5: Check Connection Settings
  Before You Contact Customer Care
— Other Helpful Information

Other helpful information:

• Stay connected! Use Yahoo! Messenger for the Web to keep in touch with your contacts.
• The more technically advanced may want to check the connection options in the article, "How to setup Messenger to use a proxy server to connect to the Internet."
• If Yahoo! Messenger Customer Care asks you to create log files and a screenshot, this article explains how to do it: "How to submit diagnostic log files for XP and Vista."