problem with postgres

[eluser]Unknown[/eluser]
hi!

first post an already about a problem, sorry :-)

i tried to experiment with codeigniter with a postgres database. as soon as i entered the database-config (/application/config/database.php) i got a blank screen with absolutely no output on any url i entered within the php application. there were no logs in apache error.log and in the logs dir in the framework-dir. i tried to set the loglevel to max but it didnt work. is there something wrong with the postgres driver? how can i debug such an error? my config is apache2 with modphp5 and the latest codeignitter framework.