alulageo on "Website is blank but open with admin command - No access to wp-admin/edit"

Website is blank but open with admin command - No access to wp-admin/edit

My website http://www.u-n-i-c.net has suddenly gone blank and access mode changed, after Upgrade to WordPress 4.0 and updates of different plugins.

****************** Problems: ************

a) When keying in the website adress
http://www.u-n-i-c.net => Page is blank

b) I cannot access my wesbite as Administrator with WordPress.
when entering the same with admin option
http://www.u-n-i-c.net/wp-admin/ => the page appear but it doesn't appear in administration mode

I have a multisite runing a second website (EN)
installed on /gma

http://www.georgealula.com that is working properly

**************** Attemped solution **************
renaming Plugins directory => Plugins.hold
or
renaming /themes/used => /Themes/used.hold

I have recover the site from backup before the plugins Updates and the database also was recovered.

---------------- In wp-config.php -----------------

[ Moderator note: code fixed. Please wrap code in the backtick character or use the code button. ]

/* Multisite. */
define( 'WP_ALLOW_MULTISITE', true );

----------- MULTISITES AND MULTILANGUAGES (FR & EN) SITES ---------

/* WordPress Localized Language. */
define( 'WPLANG', 'fr_FR' );

/* Custom WordPress URL. */
define( 'WP_SITEURL',     'http://www.u-n-i-c.net/' );
define( 'WP_HOME',        'http://www.u-n-i-c.net/' );
define( 'WP_CONTENT_URL', 'http://www.u-n-i-c.net/wp-content/' );
define( 'UPLOADS',        'http://www.u-n-i-c.net/wp-content/uploads' );
define( 'WP_PLUGIN_URL',  'http://www.u-n-i-c.net/wp-content/plugins' );

----------------- .HTACCESS ------------------

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

-------------------------------------------------------

************ Results *****************
Didn't help show the page or access the Administration site

*************** URGENT HELP NEEDED ***********
Any body have an idea which direction to take.

Thanks.