problem afther backup and restore: no administrator page

i had to moove the website from a folder to the root

the website was in http://www.motorx.it/nuovo and it was working good
i mooved it in http://www.motorx.it , the frontend works good but but i can join in the administrator page, when i write http://www.motorx.it/administrator i see just a withe page

for the backup i used Akeba Backup

how can i resolve the problem?

Sure, but this is not a support question - I suggest to hire somebody.
bacuse it may take 30 minutes or few hour to solve it.

ok, i found the solution..
one of the installed plugin that use the jQuery goes in conlict

i write here the solution for somebodyelse with the same problem

open the behavior.php file in /libraries/joomla/html/html

approximately to the line comment the follonw string in this way

$document->addStyleDeclaration('html { display:none }');

in: // $document->addStyleDeclaration('html { display:none }');

Thanks, but .... Very strange that you have to modify Joomla core files rather then changing code of plugin.