You mention this has not been switched on for a long time, and also mention chatroom there. We havent run chat for a very very long time, so that will not work. In terms of the site itself, do you know what version its on? You can chance an address used in the conf_global.php file. The site doesnt have any concern as to what IP that address is using (although the address itself may be an IP if doing something on local of course)