Ah so you have a firewall. Did you configure it for LW:
http://www.limewire.com/english/content/firewalls.shtml
So you tried the Jum build & it still wouldn't connect?
After installing everything did you repair permissions? See
http://www.gnutellaforums.com/showth...6094#post96094
Whilst LW is closed try deleting LW's Prefs folder found here: /Users/your_username/Library/Preferences/LimeWire (this will mean you will need to reset the preferences settings within LW next time you open it.)
Give LW some time to connect. Even go to the file menu & select disconnect & then select connect again. Wait some time to give it a chance to load everything - the incomplete & shared files which can take a while.