Q: I updated my aol password on aol online.  the mac will not accept or recognize the new password even though I can logon to aol with that password.

Hello there, Dana1228.

It sounds like you've done some great troubleshooting on your Mac Pro, trying to get your AOL mail account setup in your Mail application. The following Knowledge Base article offers up some additional steps and recommendations to review:

If you can’t send or receive email on your Mac

If you still can’t send or receive email

1. Make sure that you installed the latest Mac software updates, especially if the issue occured immediately after installing a previous update.
2. In OS X El Capitan, you might see a status icon and brief error message in the upper-right corner of the Mail window, beneath the Search field. The message might say “Network Offline” or “Login Failed,” for example. Click the message to see more details about the issue.
   
3. Check your connection in Mail Connection Doctor. It might be able to tell you more about the issue.

Thanks for reaching out to Apple Support Communities.

Kind Regards.