I\'ve got a Wordpress site on our home intranet that has run into trouble now that the IP address has changed - The index page loads, but not the CSS and I can\'t log in to
You have to change the 'home' and 'siteurl' in the settings. Since you cannot open the admin side of wordpress, open the database in phpMyAdmin(or something similar).
The options can be found in the 'wp_options' table(wp_ prefix might be different). Find the necessary setting using this query...
SELECT * FROM `wp_options` WHERE `option_name` IN ('siteurl', 'home')
Change the values of both the options to the new IP.