can't setup wordpress on Fedora17 x64 on local server

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hi. i'm new to wordpress and fedora. i'm trying to install wordpress 3.3.1 on my f17 machine. i extracted files to "/var/www/html/wordpress" folder. and set it read/write permission (have tried both 777 and 775).

i can connect to "phpmyadmin", check mysql with php code >>> "mysql_connect("localhost", "root", "");

it was all ok. i've filled all my correct data in wp-config.php file and created a database for it. when i enter http://localhost/wordpress it show me "Database Error" "Error establishing a database connection" What are the possibilities that cause the problem ? is it because of selinux ?

Please anybody help me with this.... :) i've been trying it for a week.