Hi,
In Applications/Utilities is the Keychain Access App.
Either in the Login item (top left) or Local Items (also top left) should be the item for the AIM Login
In may read like this:-
com.apple.account.aim.password and when you mouse over it more details about which AIM ID/Screen Name it is should appear.
You may see it look like this though:-
It will say Application Password in the top section when you mouse over or select it.
this type is more common for Screen Names that were registered at AIM rather than from elsewhere like the Apple ID.
If the AIM item is a Screen Name from AIM then it is also possible that an Account in System Preferences > Internet Accounts have been set up and will list it as AOL and add @AOL.com to the end of it.
If in Messages it has the @AOL.com added edit the Account so it does not list there.
If the Keychain access app does not list the item it is possible you have lost Permissions to Write to the Keychain.
In the Finder use the Go Menu > GO to Folder and enter ~/Library/Keychains
Once in this folder highlight the Login item.
Then do a Get Info (CMD+i keys together)
Scroll to the bottom of the Info panel.
Your shortname should appear.
You should have Read and Write permissions.
Highlight your name.
Then use the little cogwheel icon under the list.
This should be greyed out but start about making you the Owner. (if you already are it will be greyed out).
Repeat for Login Items
7:59 p.m. Tuesday; July 14, 2015
iMac 2.5Ghz i5 2011 (Mavericks 10.9)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
