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It sounds like Dovecot, your IMAP server, isn't running.
You can fix that by logging in over SSH as root, and running:
/etc/init.d/dovecot restart
However, the fact that it isn't running is a bit odd!
How much RAM is available on your system? You can determine that by running "free -m". Sometimes, having too little RAM can cause daemons to stop working.
You can also get further clues by looking in /var/log/maillog or /var/log/mail.log, and look for errors relating to the Dovecot daemon.
-Eric