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Hi,
what you did:
-make new install online, or
-just uploaded all the files from your lockal install.
If it is the second it will not work... You will have to transfer the database and make some changes in mainfile.php.
But if you are new to XOOPS it will be more easy just to make new install...
If you made new install and have a blank page, you may try to log in and enable phpdebug in XOOPS admin -> Preferences -> general - 'phpdebug' option and look for errors (Warnings and Fatal errors). If you can't login, but have phpmyadmin, you may do changes in database to enable debug mode, but it is more complicated...