Site is just a white page after a manual install

First check if you do not have have any blank space before <?php in wp-config.php if there is none then try and add this code in next line

error_reporting(E_ALL); ini_set('display_errors', 1);

In addition, add the following code above /* That’s all, stop editing! Happy blogging. */ :

define( 'WP_DEBUG', true);
See what error you get.

Try:
– switching to the Twenty Ten theme by renaming all other theme folders in wp-content/themes using FTP or whatever file management application your host provides.

– resetting the plugins folder by FTP or phpMyAdmin.

Try re-uploading all files & folders from a fresh download of WordPress.