Unintentional removed CiviCRM compnents in Joomla, Re-Installation fails
Have you deleted /media/civicrm/templates_c? That's where Civi caches pages and can be a cause of white screen of doom. You could maybe try deleting/moving the entire media/civicrm directory (saving any files or extensions you've uploaded there) before installing. If that still doesn't help maybe try emptying the dbse tables: 

civicrm_acl_cache
civicrm_acl_contact_cache
civicrm_cache
civicrm_group_contact_cache


If none of that works - then maybe you could try creating a new install of CiviCRM to a new database (making sure it's the same version as the one you deleted) and then change the dbse settings in 

/components/com_civicrm/civicrm.settings.php
/administrator/components/com_civicrm/civicrm.settings.php


to point to your old dbse (and then deleting the templates_c directory again)