Problem with loading (jqery / css) CiviCRM files in Joomla 3.4.8
You need to ensure that your paths are set correctly. In the menu go to Administer > System Settings > Resource URLs and correct the CiviCRM Resource URL. (if the menu isn't working, type directly the path civicrm/admin/setting/url&amp;reset=1 to get there) In 4.7 in most cases it should simply be [civicrm.root]/.

If you're unclear what the correct url should be, try doing "view source" in your browser and check what urls are being prepended to Civi's js/css files - what about it is incorrect? That should give a hint of what needs fixing.