Re Installing Mediawiki

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http://serverfault.com – One of our Shell script had an wrong code and removed files inside the mediawiki folders. The files which are present in outside are not deleted,LocalSettings.php and other files are still there. When I try to access /mw/index.php I see a empty screen. So I copied all the files from backup and placed it in correcponding folders inside mediawiki. But still I'm getting empty screen, How do I get it back? Please help me to get out of this Thanks (HowTos)