Mail won't retrieve messages from my primary Comcast account

Apple Mail, Version 2.1 (752/752.2), downloads emails from my yahoo.com and gmail.com accounts, but it has suddenly stopped downloading emails from my primary Comcast account to my G5 iMac. I get no error messages.
Trying to retrieve email in Apple Mail can sometimes cause the Comcast email server to classify all unread messages as read. If Mail is set to "remove copy from server right away after retrieving a message," then all of my new messages are deleted from the Comcast server before I ever see them, even though they have not been retrieved.
Curiously, the only emails that Mail can access from my primary Comcast account are those that have been automatically forwarded from my secondary Comcast accounts. (Just out of curiosity, I tried manually forwarding a message from my primary account to my primary account; it could not be retrieved by Mail.)
My wife and daughter, on the same hard-wired ethernet LAN, have no problem accessing their primary Comcast email accounts with Mail on their Macs (MacBook and G4 iMac). Our settings for Comcast accounts seem to be identical on all three computers.
Perhaps coincidentally, I also have Comcast Digital Voice VoIP telephone service, and this email problem started while Comcast was troubleshooting problems with my voicemail. I use separate cable modems for phone (Arris TM402P) and Internet (Motorola SB5100).
I've tried: 1) rebuilding all of the mailboxes in my Mail Inbox; 2) deleting all of my emails on the Comcast server and emptying the trash; 3) setting the outgoing SMTP mail server on all of my email accounts to Comcast; 4) repairing permissions and running maintenance scripts; 5) shutting down the computer overnight; 6) Comcast support -- they try, but then give up and say that they don't support Apple Mail.
I'd appreciate any assistance.
iMac G5 1.9GHz   Mac OS X (10.4.7)   1 GB RAM

This problem was apparently caused by one of two things: 1) trying to use Mail with an AIM.com IMAP account; or 2) corruption somewhere in my Rules and Mailboxes.
I had to rebuild my POP accounts from the ground up. First, I backed up Mail preferences and messages. After quitting Mail and deleting the preference file com.apple.mail.plist and the Mail folder from Users/Home/Library, I launched Mail and created new accounts and new rules.
Prior to this issue, I had been using Apple Mail for three years to retrieve POP mail from Comcast and other accounts. This was my first experience with IMAP.
iMac G5 1.9GHz   Mac OS X (10.4.7)  

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