weird problem

[eluser]Блум[/eluser]
Hello everybody,
I have a strange problem here.. I build a CI driven site on my development server in my office (PHP 5.2.3, MySQL 5.0.30) and it works just fine. But when I upload it on the production server (PHP 5.2.5, MySQL 5.0.45) it just doesn't work. No errors, no warnings, the error_log is empty, just absolute lack of output. Nothing.. As I can see all the required files are loaded, and the database is there.

mm.. help

Thank You