Your issue lies within wp-config.php file. You have to double check the $table_prefix field and make sure that it corresponds to table prefixes in your actual database.
/** * WordPress Database Table prefix. * * You can have multiple installations in one database if you give each a unique * prefix. Only numbers, letters, and underscores please! */ $table_prefix = ‘wp_’;
It has to correspond to the last letter and watch out for UPPER/lower case mismatches. Use phpMyAdmin to examine your tables. Each and every table in your database has to have the same prefix that is set up in your wp-config.
Correct table names in your database:
wp_commentmeta wp_comments wp_links
Incorrect table names in your Wordpress database:
WP_commentmeta wP_comments wp_wp_links
Even one symbol difference will force your WordPress into installation mode.