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You lost the database? If you get blank pages, ask the admin to turn on php-debug, so you can see what is causing the errors. Also, use phpmyadmin or a similar db tool to check the database integrity, that can help as well.
So long we don't know the specific error (also check the
XOOPS Wiki on how to enable php-debug without admin access), we can only guess at the cause, and we will not be able to help.
Herko