PHP-GD not work

[Laci]

Hello!

No one has any idea about this?:
"I am having trouble with making GD work on my server. Both GD and 
PHP-GD is installed on the server, but when I am trying to use a script 
that require GD I get a white page. Is there some kind of configuration 
needed to make it work properly? Needs so help here,.I am using FC5, 
the PHP, and PHP-GD s installed with yum. 

"

No errors, no warnings, just not work.

thanks in advance
Laci